Dell | OptiPlex 780 SFF | Service manual | Dell OptiPlex 780 SFF Service manual

Dell™ OptiPlex™ 780 Service Manual
Small Form Factor Computer
Working on Your Computer
Removing and Replacing Parts
Specifications
Diagnostics
System Setup
Notes, Cautions, and Warnings
NOTE: A NOTE indicates important information that helps you make better use of your computer.
CAUTION: A CAUTION indicates potential damage to hardware or loss of data if instructions are not
followed.
WARNING: A WARNING indicates a potential for property damage, personal injury, or death.
If you purchased a Dell™ n Series computer, any references in this document to Microsoft® Windows® operating systems are
not applicable.
Information in this document is subject to change without notice.
© 2009 Dell Inc. All rights reserved.
Reproduction of this material in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden.
Trademarks used in this text: Dell, the DELL logo, OptiPlex are trademarks of Dell Inc.; Intel, Core, and Celeron are either trademarks or
registered trademarks of Intel Corporation in the U.S. and other countries; Microsoft, Windows, Windows Server, MS-DOS and Windows Vista are
either trademarks or registered trademarks of Microsoft Corporation in the United States and/or other countries.
Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products.
Dell Inc. disclaims any proprietary interest in trademarks and trade names other than its own.
October 2012 Rev. A02
Working on Your Computer
Dell™ OptiPlex™ 780 Service Manual—Desktop
Before Working Inside Your Computer
Recommended Tools
Turning Off Your Computer
After Working Inside Your Computer
Before Working Inside Your Computer
Use the following safety guidelines to help protect your computer from potential damage and to help to ensure your personal
safety. Unless otherwise noted, each procedure included in this document assumes that the following conditions exist:
You have performed the steps in Working on Your Computer.
You have read the safety information that shipped with your computer.
A component can be replaced or—if purchased separately—installed by performing the removal procedure in reverse
order.
WARNING: Before working inside your computer, read the safety information that shipped with your
computer. For additional safety best practices information, see the Regulatory Compliance Homepage at
www.dell.com/regulatory_compliance.
CAUTION: Many repairs may only be done by a certified service technician. You should only perform
troubleshooting and simple repairs as authorized in your product documentation, or as directed by the
online or telephone service and support team. Damage due to servicing that is not authorized by Dell is
not covered by your warranty. Read and follow the safety instructions that came with the product.
CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by
periodically touching an unpainted metal surface, such as a connector on the back of the computer.
CAUTION: Handle components and cards with care. Do not touch the components or contacts on a card.
Hold a card by its edges or by its metal mounting bracket. Hold a component such as a processor by its
edges, not by its pins.
CAUTION: When you disconnect a cable, pull on its connector or on its pull-tab, not on the cable itself.
Some cables have connectors with locking tabs; if you are disconnecting this type of cable, press in on the
locking tabs before you disconnect the cable. As you pull connectors apart, keep them evenly aligned to
avoid bending any connector pins. Also, before you connect a cable, ensure that both connectors are
correctly oriented and aligned.
NOTE: The color of your computer and certain components may appear differently than shown in this document.
To avoid damaging your computer, perform the following steps before you begin working inside the computer.
1. Ensure that your work surface is flat and clean to prevent the computer cover from being scratched.
2. Turn off your computer (see Turning Off Your Computer).
CAUTION: To disconnect a network cable, first unplug the cable from your computer and then unplug the
cable from the network device.
3.
5.
6.
7.
Disconnect all network cables from the computer.
Disconnect your computer and all attached devices from their electrical outlets.
Press and hold the power button while the system is unplugged to ground the system board.
Remove the cover.
CAUTION: Before touching anything inside your computer, ground yourself by touching an unpainted metal
surface, such as the metal at the back of the computer. While you work, periodically touch an unpainted
metal surface to dissipate static electricity, which could harm internal components.
Recommended Tools
The procedures in this document may require the following tools:
Small flat-blade screwdriver
Phillips screwdriver
Small plastic scribe
Flash BIOS update program CD (see the Dell Support website at support.dell.com)
Turning Off Your Computer
CAUTION: To avoid losing data, save and close all open files and exit all open programs before you turn off
your computer.
1. Shut down the operating system:
In Windows Vista®:
Click Start
Shut Down.
, then click the arrow in the lower-right corner of the Start menu as shown below, and then click
In Windows® XP:
Click Start® Turn Off Computer® Turn Off.
The computer turns off after the operating system shutdown process is complete.
2. Ensure that the computer and all attached devices are turned off. If your computer and attached devices did not
automatically turn off when you shut down your operating system, press and hold the power button for about 6
seconds to turn them off.
After Working Inside Your Computer
After you complete any replacement procedure, ensure you connect any external devices, cards, and cables before turning on
your computer.
1. Replace the cover.
CAUTION: To connect a network cable, first plug the cable into the network device and then plug it into the
computer.
2.
3.
4.
5.
Connect any telephone or network cables to your computer.
Connect your computer and all attached devices to their electrical outlets.
Turn on your computer.
Verify that the computer works correctly by running the Dell Diagnostics. See Dell Diagnostics.
Back to Contents Page
Back to Contents Page
Removing and Replacing Parts
Dell™ OptiPlex™ 780 Service Manual—Small Form Factor
Cover
Coin-Cell Battery
Memory
Optical Drive
Floppy Drive
Heat Sink and Processor
Expansion Card
Hard Drive
Power Supply
System Board
IO Panel
Fan
Back to Contents Page
Back to Contents Page
Technical Specifications
Processor
Controls and Lights Memory Network
Expansion Bus Audio
Video
Power System Information System Board Connectors
Cards
Physical Drives Environmental External Connectors NOTE: Offerings may vary by region. For more information regarding the configuration of your computer, click Start®
Help and Support and select the option to view information about your computer.
NOTE: Unless otherwise stated, the specifications are identical for mini-tower, desktop, and small form factor
computers.
Processor
Type
Intel® Core™2 Duo; FSB up to 1333 MHz
Intel Core 2 Quad; FSB up to 1333 MHz
Intel Pentium® Dual Core; FSB up to
1066 MHz
Intel Celeron®; FSB up to 800 MHz
Level 2 (L2) cache
at least 512 KB pipelined-burst, eightway set associative, writeback SRAM
Memory Type
DDR3 SDRAM (non-ECC memory only)
Speed
1067 MHz
Connectors
four
Capacity
1 GB, 2 GB or 4 GB non-ECC
Minimum memory
1 GB
Maximum memory
16 GB
Video
Integrated
Intel graphics media accelerator X4500
up to 256 MB shared video memory (total
system memory greater than 512 MB)
Discrete
PCI Express x16 slot supports either a PCI
Express card or a DVI add-on card (for
dual-monitor support)
Audio
Integrated
Intel high definition audio
Network
Integrated
Intel integrated network interface card
capable of 10/100/1000 Mb/s
communication
System Information Chipset
Intel® Q45 Express chipset w/ICH10DO
DMA channels
eight
Interrupt levels
24
BIOS chip (NVRAM)
64 Mb
Expansion Bus Bus type
PCI 2.3
PCI Express 2.0
SATA 1.0A and 2.0
eSATA
USB 2.0
Bus speed
PCI: 133 MB/s
PCI Express:
x1-slot bidirectional speed — 250
MB/s
x16-slot bidirectional speed — 8
GB/s
SATA: 1.5 Gbps and 3.0 Gbps
eSATA: 3.0 Gbps
USB: 480 Mbps
Cards
PCI
Mini-tower
up to two full height cards
Desktop
without riser card — up to two low profile
cards
Small form factor
with riser card — up to two full height
cards
one low profile card
PCI Express x1
Mini-tower
one full height card
Desktop
none
Small form factor
none
PCI Express x16
Mini-tower
one full height card
Desktop
without riser — one low profile card
with riser — one full height card
Small form factor
one low profile card
NOTE: The PCI Express x16 slot is disabled when a display is connected to the
integrated video connector.
Drives Externally accessible
5.25 inch drive bay(s)
Mini-tower
Desktop
Small form factor
for SATA DVD-ROM, DVD+/-RW, or CD
+/-RW drives
two bays
one bay
one slimline bay
3.5 inch drive bay
for 19-in-1 Media Card Readers
Mini-tower
one bay
Desktop
one bay
Small form factor
one slimline bay
Internally accessible
3.5 inch drive bay(s)
for hard drives
Mini-tower
two bays
Desktop
one bay
Small form factor
one bay
NOTE: Your computer can support up to two 2.5 inch hard drives with brackets.
External Connectors Audio
Back panel
two connectors for line-in/ microphone
and line-out
Front panel
two front-panel connectors for
headphones and microphone
eSATA
one 7-pin connector
Network
one RJ45 connector
Parallel
one 25-pin connector (bidirectional)
Serial
one 9-pin connector; 16550C-compatible
USB
Front panel
two connectors
Back panel
six connectors
Video
one 15-hole VGA connector
one 20-pin DisplayPort connector
System Board Connectors
PCI 2.3
Mini-tower
data width (maximum) — 32 bits
two 120-pin connectors
Desktop
two 120-pin connectors
Small form factor
one 120-pin connector
PCI Express x1
Mini-tower
Desktop
Small form factor
PCI Express x16
data width (maximum) — one PCI Express
lane
one 36-pin connector
not applicable
not applicable
one 164-pin connector
data width (maximum) — 16 PCI Express
lanes
Serial ATA
Mini-tower
four 7-pin connectors
Desktop
three 7-pin connectors
Small form factor
three 7-pin connectors
Memory
four 240-pin connectors
Internal USB device
one 10-pin connector (supports two USB
ports)
Processor fan
one 5-pin connector
Hard-drive fan
one 5-pin connector
Front panel control
one 40-pin connector
Processor
one 775-pin connector
Power 12V
one 4-pin connector
Power
one 24-pin connector
Controls and Lights Front of the computer
Power button
push button
Power light
blinking green — indicates that the
computer is in sleep state
solid green — indicates that the computer
is in power-on state
blinking amber — indicates a problem
with the system board
solid amber — indicates that the system
board is unable to initialize
Drive activity light
blinking green — indicates that the
computer is reading data from or writing
data to the hard drive
Network connectivity light
green — indicates that a good connection
exists between the network and the
computer
off (no light) — indicates that the
computer is not detecting a physical
connection to the network
Diagnostic lights
four lights. For more information, see
Diagnostics.
Back of the computer
Link integrity light on integrated
network adapter
green — a good 10 Mbps connection
exists between the network and the
computer.
orange — a good 100 Mbps connection
exists between the network and the
computer.
yellow — a good 1000 Mbps connection
exists between the network and the
computer.
off (no light) — the computer is not
detecting a physical connection to the
network.
Network activity light on integrated
network adapter
yellow light — A blinking yellow light
indicates that network activity is present.
Power DC power supply
Wattage
Mini-tower
305 W (non-EPA) or 255 W (EPA)
Desktop
255 W (EPA)
Small form factor
235 W (EPA)
Maximum heat dissipation
Mini-tower
1041 BTU/hr
Desktop
955 BTU/hr
Small form factor
938 BTU/hr
Voltage
90–265 VAC, 50/60 Hz
Coin-cell battery
3 V CR2032 lithium coin cell
NOTE: Heat dissipation is calculated by using the power supply wattage rating.
NOTE: See the safety information that shipped with your computer for important
voltage setting information.
Physical Height
Mini-tower
40.80 cm (16.10 inches)
Desktop
11.40 cm (4.50 inches)
Small form factor
9.26 cm (3.65 inches)
Width
Depth
Mini-tower
18.70 cm (7.40 inches)
Desktop
39.90 cm (15.70 inches)
Small form factor
31.40 cm (12.40 inches)
Mini-tower
43.30 cm (17.00 inches)
Desktop
35.30 cm (13.90 inches)
Small form factor
34.00 cm (13.40 inches)
Weight
Mini-tower
11.70 kgs (25.80 lbs)
Desktop
8.26 kgs (18.20 lbs)
Small form factor
6.80 kgs (15.00 lbs)
Environmental Temperature
Operating
10° to 35°C (50° to 95°F)
Storage
–40° to 65°C (–40° to 149°F)
Relative humidity (noncondensing)
operating: 20% to 80% (maximum wet
bulb temperature: 29°C)
storage: 5% to 95% (maximum wet bulb
temperature: 38°C
Maximum vibration
Operating
5 to 350 Hz at 0.0002 G 2 /Hz
Storage
5 to 500 Hz at 0.001 to 0.01 G 2 /Hz
Maximum shock
Operating
40 G +/- 5% with pulse duration of 2
msec +/- 10% (equivalent to 20 in/sec
[51 cm/sec])
Storage
105 G +/- 5% with pulse duration of 2
msec +/- 10% (equivalent to 50 in/sec
[127 cm/sec])
Altitude
Operating
–15.2 to 3048 m (–50 to 10,000 ft)
Storage
–15.2 to 10,668 m (–50 to 35,000 ft)
Airborne contaminant level
Back to Contents Page
G2 or lower as defined by ISA-S71.041985
Back to Contents Page
Diagnostics
Dell™ OptiPlex™ 780 Service Manual
Dell Diagnostics
Power Button Light Codes
Beep Codes
Diagnostic Lights
Dell Diagnostics
When to Use the Dell Diagnostics
It is recommended that you print these procedures before you begin.
NOTE: The Dell Diagnostics software works only on Dell computers.
NOTE: The Drivers and Utilities media is optional and may not ship with your computer.
Enter system setup (see Entering System Setup), review your computer's configuration information, and ensure that the
device you want to test displays in System Setup and is active.
Start the Dell Diagnostics from either your hard drive or from the Drivers and Utilities media.
Starting the Dell Diagnostics From Your Hard Drive
1. Turn on (or restart) your computer.
2. When the DELL logo appears, press <F12> immediately.
NOTE: If you see a message stating that no diagnostics utility partition has been found, run the Dell Diagnostics from
your Drivers and Utilities media.
If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft®
Windows® desktop. Then shut down your computer and try again.
3. When the boot device list appears, highlight Boot to Utility Partition and press <Enter>.
4. When the Dell Diagnostics Main Menu appears, select the test that you want to run.
Starting the Dell Diagnostics From the Drivers and Utilities Disc
1. Insert the Drivers and Utilities disc.
2. Shut down and restart the computer.
When the DELL logo appears, press <F12> immediately.
If you wait too long and the Windows logo appears, continue to wait until you see the Windows desktop. Then shut
down your computer and try again.
NOTE: The next steps change the boot sequence for one time only. On the next startup, the computer boots according
to the devices specified in the system setup program.
3. When the boot device list appears, highlight Onboard or USB CD-ROM Drive and press <Enter>.
4. Select the Boot from CD-ROM option from the menu that appears and press <Enter>.
5. Type 1 to start the menu and press <Enter> to proceed.
6. Select Run the 32 Bit Dell Diagnostics from the numbered list. If multiple versions are listed, select the version
appropriate for your computer.
7. When the Dell Diagnostics Main Menu appears, select the test you want to run.
Dell Diagnostics Main Menu
1. After the Dell Diagnostics loads and the Main Menu screen appears, click the button for the option you want.
Option
Function Express
Test
Performs a quick test of devices. This test typically takes 10 to 20 minutes and requires no interaction on your
part. Run Express Test first to increase the possibility of tracing the problem quickly.
Extended
Test
Performs a thorough check of devices. This test typically takes 1 hour or more and requires you to answer
questions periodically.
Custom
Test
Tests a specific device. You can customize the tests you want to run.
Symptom Lists the most common symptoms encountered and allows you to select a test based on the symptom of the
Tree
problem you are having.
2. If a problem is encountered during a test, a message appears with an error code and a description of the problem.
Write down the error code and problem description and follow the instructions on the screen.
3. If you run a test from the Custom Test or Symptom Tree option, click the applicable tab described in the following
table for more information.
Tab
Function Results
Displays the results of the test and any error conditions encountered.
Errors
Displays error conditions encountered, error codes, and the problem description.
Help
Describes the test and may indicate requirements for running the test.
Configuration Displays your hardware configuration for the selected device.
The Dell Diagnostics obtains configuration information for all devices from system setup, memory, and
various internal tests, and it displays the information in the device list in the left pane of the screen. The
device list may not display the names of all the components installed on your computer or all devices
attached to your computer.
Parameters
Allows you to customize the test by changing the test settings.
4. When the tests are completed, if you are running the Dell Diagnostics from the Drivers and Utilities disc, remove the
disc.
5. Close the test screen to return to the Main Menu screen. To exit the Dell Diagnostics and restart the computer, close
the Main Menu screen.
Power Button Light Codes
The diagnostic lights give much more information about the system state, but legacy power light states are also supported in
your computer. The power light states are shown in following table.
Power
Light
State
Off
Description
Power is off, light is blank.
Blinking
Amber
Solid
Amber
Blinking
Green
Solid
Green
Initial state of light at power up.
Indicates system has power, but the POWER_GOOD signal is not yet active.
If the Hard Drive light is off, it is probable that the power supply needs to be replaced.
If the Hard Drive light on, it is probable that an onboard regulator or VRM has failed. Look at the diagnostic
lights for further information.
Second state of the light at power up. Indicates the POWER_GOOD signal is active and it is probable that the
power supply is fine. Look at the diagnostic lights for further information.
System is in a low power state, either S1 or S3. Look at the diagnostic lights to determine which state the
system is in.
System is in S0 state, the normal power state of a functioning machine.
The BIOS will turn the light to this state to indicate it has started fetching op-codes.
Beep Codes
If the monitor cannot display error messages during the POST, the computer may emit a series of beeps that identifies the
problem or that can help you identify a faulty component or assembly. The following table lists the beep codes that may be
generated during the POST. Most beep codes indicate a fatal error that prevents the computer from completing the boot
routine until the indicated condition is corrected.
Code
Cause
1-1-2
Microprocessor register failure
1-1-3
NVRAM read/write failure
1-1-4
ROM BIOS checksum failure
1-2-1
Programmable interval timer failure
1-2-2
DMA initialization failure
1-2-3
DMA page register read/write failure
1-3
Video Memory Test failure
1-3-1 through 2-4-4 Memory not being properly identified or used
3-1-1
Slave DMA register failure
3-1-2
Master DMA register failure
3-1-3
Master interrupt mask register failure
3-1-4
Slave interrupt mask register failure
3-2-2
Interrupt vector loading failure
3-2-4
Keyboard Controller Test failure
3-3-1
NVRAM power loss
3-3-2
Invalid NVRAM configuration
3-3-4
Video Memory Test failure
3-4-1
Screen initialization failure
3-4-2
Screen retrace failure
3-4-3
Search for video ROM failure
4-2-1
No timer tick
4-2-2
Shutdown failure
4-2-3
Gate A20 failure
4-2-4
Unexpected interrupt in protected mode
4-3-1
Memory failure above address 0FFFFh
4-3-3
Timer-chip counter 2 failure
4-3-4
Time-of-day clock stopped
4-4-1
Serial or parallel port test failure
4-4-2
Failure to decompress code to shadowed memory
4-4-3
Math-coprocessor test failure
4-4-4
Cache test failure
Diagnostic Lights
To help troubleshoot a problem, your computer has four lights labeled 1, 2, 3, and 4 on the bank panel. When the computer
starts normally, the lights flash before turning off. If the computer malfunctions, the sequence of the lights help to identify
the problem.
NOTE: After the computer completes POST, all four lights turn off before booting to the operating system.
Light Pattern Problem Description
The computer is in a
normal off condition or
a possible pre-BIOS
failure has occurred.
Suggested Resolution
Plug the computer into a working electrical outlet.
If the problem persists, contact Dell.
The diagnostic lights
are not lit after the
computer successfully
boots to the operating
system.
A possible processor
failure has occurred.
Reseat the processor (see Processor information for your computer).
If the problem persists, contact Dell.
Memory modules are
detected, but a memory
failure has occurred.
If two or more memory modules are installed, remove the modules, then
reinstall one module and restart the computer. If the computer starts
normally, continue to install additional memory modules (one at a time)
until you have identified a faulty module or reinstalled all modules
without error.
If available, install working memory of the same type into your
computer.
If the problem persists, contact Dell.
A possible graphics
card failure has
occurred.
Reseat any installed graphics cards.
If available, install a working graphics card into your computer.
If the problem persists, contact Dell .
A possible floppy drive
or hard drive failure
has occurred.
Reseat all power and data cables.
A possible USB failure
has occurred.
Reinstall all USB devices and check all cable connections.
No memory modules
are detected.
If two or more memory modules are installed, remove the modules, then
reinstall one module and restart the computer. If the computer starts
normally, continue to install additional memory modules (one at a time)
until you have identified a faulty module or reinstalled all modules
without error.
If available, install working memory of the same type into your
computer.
If the problem persists, contact Dell.
Memory modules are
detected, but a memory
configuration or
compatibility error has
occurred.
Ensure that no special requirements for memory module/connector
placement exist.
Ensure that the memory you are using is supported by your computer
(see the "Specifications" section for your computer).
If the problem persists, contact Dell.
A possible expansion
card failure has
occurred.
Determine if a conflict exists by removing an expansion card (not a
graphics card) and restarting the computer.
If the problem persists, reinstall the card you removed, then remove a
different card and restart the computer.
Repeat this process for each expansion card installed. If the computer
starts normally, troubleshoot the last card removed from the computer
for resource conflicts.
If the problem persists, contact Dell.
Another failure has
occurred.
Ensure that all hard drive and optical drive cables are properly
connected to the system board .
If there is an error message on the screen identifying a problem with a
device (such as the floppy drive or hard drive), check the device to
make sure it is functioning properly.
If the operating system is attempting to boot from a device (such as
the floppy drive or optical drive), check system setup to ensure the boot
sequence is correct for the devices installed on your computer.
If the problem persists, contact Dell.
Back to Contents Page
Back to Contents Page
System Setup
Dell™ OptiPlex™ 780 Service Manual—Mini-Tower, Desktop, and Small Form Factor
Boot Menu
Navigation Keystrokes
Entering System Setup
System Setup Simulation
System Setup Menu Options
Boot Menu
Press <F12> when the Dell™ logo appears to initiate a one-time boot menu with a list of the valid boot devices for the system.
The options listed are:
Internal HDD
CD/DVD/CD-RW Drive
Onboard NIC
BIOS Setup
Diagnostics
This menu is useful when you are attempting to boot to a particular device or to bring up the diagnostics for the system. Using the boot menu does not make any
changes to the boot order stored in the BIOS.
Navigation Keystrokes
Use the following keystrokes to navigate the System Setup screens.
Navigation Keystrokes
Action
Keystroke
Expand and collapse field
<Enter>, left- or right-arrow key, or +/–
Expand or collapse all fields
<>
Exit BIOS
<Esc>—Remain in Setup, Save/Exit, Discard/Exit
Change a setting
Left or right-arrow key
Select field to change
<Enter>
Cancel modification
<Esc>
Reset defaults
<Alt><F> or Load Defaults menu option
Entering System Setup
Your computer offers the following BIOS and System Setup options:
Bring up a one-time boot menu by pressing <F12>
Access System Setup by pressing <F2>
<F12> Menu
Press <F12> when the Dell™ logo appears to initiate a one-time boot menu with a list of the valid boot devices for the computer. Diagnostics and Enter Setup
options are also included in this menu. The devices listed on the boot menu depend on the bootable devices installed in the computer. This menu is useful when you
are attempting to boot to a particular device or to bring up the diagnostics for the computer. Making changes in the boot menu does not make any changes to the
boot order stored in the BIOS.
<F2>
Press <F2> to enter System Setup and make changes to user-definable settings. If you have trouble entering System Setup using this key, press <F2> when the
keyboard lights first flash.
System Setup Menu Options
NOTE: System Setup options may vary depending on your computer and may not appear in the exact same order.
General
System
Board
Displays the following information:
System information: Displays BIOS Info,, System Info, Service Tag, Express Service Code, Asset Tag, Manufacture Date, and the
Ownership Date..
Memory information: Displays Installed Memory, Usable Memory, Memory Speed, Memory Channel Mode, Memory Technology,
DIMM_1 Size, DIMM_2 Size, DIMM_3 Size, and DIMM_4 Size. .
Processor information: Displays the Processor Type, Processor Speed, Processor Bus Speed, Processor L2 cache, Processor ID,
Microcode Version, Multi Core Capable and HT Capable 64-bit Technology..
PCI information: Displays available slots on the system board.
Date/Time Displays the system date and time. Changes to the system date and time take effect immediately.
Boot
Sequence
Specifies the order in which the computer attempts to find an operating system from the devices specified in this list.
Onboard or USB Floppy
HDD(will show the model currently in system)
Onboard or USB CD-Rom Drive
USB Device
Drives
Diskette drive
This field determines how the BIOS configures floppy drives, Operating Systems with USB support will recognize USB Floppy drives regardless of
this setting:
Disable - All Floppy drive are disable
Enable - All floppy drive are enable.
The "USB Controller" Setup option will affect floppy operation.
SATA
Operation
configures the operating mode of the integrated hard drive controller.
RAID Autodetect / AHCI = RAID if signed drives, otherwise AHCI
RAID Autodetect / ATA= RAID if signed drives, otherwise ATA
RAID On / ATA= SATA is configured for RAID on every boot
Legacy = The hard drive controller is configured for legacy mode
Legacy mode provides for compatibility with some older operating systems that do not support native resources assigned to the drive controller.
RAID Mode is incompatible with ImageServer. Please disable RAID mode if enabling Image Server.
S.M.A.R.T.
Reporting
This field controls whether hard drive errors for integrated drives are reported during system startup. This technology is part of the SMART(Self
Monitoring Analysis and Reporting Technology) specification.
This option is disabled by default.
Drives
Enables or disables the SATA or ATA drives connected to the system board.
System Configuration
Integrated NIC
Enables or disables the integrated network card. You can set the integrated NIC to:
Disable
Enable (default)
Enable with PXE
Enable with ImageSever
ImageServe is incompatible with RAID mode. Please disable RAID if enabling ImageServer.
PXE is needed only if intending to boost to an operating system located on a server, not if you are booting on an OS located on a hard drive in
this system.
This field enable and disable the internal USB for Flex Bay, you can set:
USB for Flex bay
USB Controller
Disable - Internal USB for Flex Bay is disable
Enable - Internal USB for Flex Bay is enable
No Boot - Internal USB for Flex Bay is enable, but not bootable. (default)
Enables or disables the integrated USB controller. You can set the USB controller to:
Enable (default)
Disable
No boot
Operating systems with USB support will recognize USB Storage
Parallel Port
Identifies and defines the parallel port settings. You can set the parallel port to:
Disable
AT
PS/2 (default)
EPP
ECP No DMA
ECP DMA 1
ECP DMA 3
Parallel Port
Address
Sets the base I/O address of the integrated parallel port.
Serial Port #1
Identifies and defines the serial port settings. You can set the serial port to:
Disable
Auto (default)
COM1
COM3
The Operating System may allocate resources even though the setting is disabled.
Serial Port #2
Identifies and defines the serial port settings. You can set the serial port to:
Disable
Auto (default)
COM2
COM4
The Operating System may allocate resources even though the setting is disabled.
Miscellaneous
Devices
Enables or disables the following onboard devices:
Front USB
Rear Dual USB
Rear Quad USB
PCI slots
Audio
Video
Primary
Video
This field determines which video controller will become the primary video controller when 2 controllers are available in the system. This selection
matters only if there are 2 video controller present.
Auto(default) - Use the add-in video controller.
Onboard/Card - Use the integrated video controller unless a Graphic care is installed. A PCI Express Graphic(PEG) card will override and disable
the integrated video controller.
Performance
Multi Core
Support
This field specifies whether the processor will have one or all cores enable. The performance of some application will improve with the additional
cores.
Intel®
This Option enables or disables the Intel® SpeedStep™ mode of the processor. When disabled, the system is placed into the highest performance
SpeedStep™ state and the Intel® SpeedStep™ applet or native operating system driver are prevented from adjusting the processor's performance. When enable.
the Intel® SpeedStep™, enabled CPU is allowed to operate in multiple performance states.
This option is disabled by default.
C States
Control
Limit CPUID
Value
This option enables or disables additional processor sleep states. The operating system may optionally use these for additional power saving when
idle.
This option is disabled by default.
This field limits the maximum value the processor Standard CPUID Function will support. Some operating systems will not complete installation when
the maximum CPUID Function supported is greater than 3.
This option is disabled by default.
HDD
Acoustic
Mode
This option allows you to optimize your hard drives performance and acoustic noise level based on your personal preferences.
Bypass(default)- Do nothing (needed for older drives)
Quiet- The drive is slower, but quieter.
Suggested - Allow drive manufacturer to select the mode.
Performance- The drive is faster, but possibly noisier.
Virtualization Support
Virtualization This Option specifies whether a Virtual Machine Monitor (VMM) can utilize the additional hardware capabilities provided by Intel® Virtualization
Technology.
Enable Intel® Virtualization Technology - This option is disabled by default.
VT for Direct
I/O
Enables or disables the Virtual Machine Monitor (VMM) from utilizing the additional hardware capabilities provided by Intel® Virtualization technology
for direct I/O.
Enable Intel® Virtualization Technology for Direct I/O - This option is disabled by default.
Trusted
Execution
Field specifies whether a Measured Virtual Machine(MVMM) can utilize the additional hardware capabilities provided by Intel® Trusted Execution
Technology. The TPM Virtualization Technology and Virtualization Technology for Direct I/O must be enable to use this feature.
Enable Intel® Trusted Execution Technology - This option is disabled by default.
Security
Administrative
Password
Provides restricted access to the computer's system setup program in the same way that access to the system can be restricted with the
System Password option.
This option is not set by default.
System Password
Displays the current status of the system's password security feature and allows a new system password to be assigned and verified.
This option is not set by default.
Password Changes
Enables or disables the user from changing the system password without the administrative password.
This option is enabled by default.
TPM Security
Enables or disables the trusted platform module (TPM) security.
You can set the TPM security to:
Deactivate (default)
Activate
Clear
NOTE: When TPM Security is set to Clear the system setup program clears the user information stored in the TPM.
CPU XD Support
Enables or disables the execute disable mode of the processor.
This option is enabled by default.
Computrace(R)
Enables or disables the optional Computrace® service designed for asset management.
You can set this option to:
Deactivate (default)
Disable
Activate
SATA-0 Password
Displays the current status of the password set for the hard drive connected to the SATA-0 connector on the system board.
You can also set a new password. This option is not set by default.
NOTE: The system setup program displays a password for each of the hard drives connected to your system board.
Power Management
AC Recovery
Determines how the system responds when AC power is re-applied after a power loss. You can set the AC Recovery to:
Power Off (default)
Power On
Last State
Auto On Time
Sets time to automatically turn on the computer.
Time is kept in the standard 12-hour format (hours:minutes:seconds).
Change the startup time by typing the values in the time and AM/PM fields.
NOTE: This feature does not work if you turn off your computer using the switch on a power strip or surge protector or if Auto Power On is set
to disabled.
Low Power
Mode
Enables or disables low power mode.
This option is disabled by default.
When low power mode is enabled, the integrated network card is disabled when the system is shutdown or in Hibernate mode. Only Add-in NIC
cards will be able to remotely wake the system.
Remote Wake
up
Allows the system to power up when a network interface controller receives a wake up signal. You can set Remote Wake up to:
Suspend Mode
Sets the power management suspend mode to:
Disable (default)
Enable
Enable with Boot NIC
S1
S3 (default)
NOTE: If the AMT Management Engine (ME) of the system is disabled, the S1 suspend mode is unavailable in the system setup.
Fan Control
Override
Controls the speed of the system fan.
NOTE: When enabled, the fan runs at full speed.
Maintenance
Service Tag
Displays the Service Tag of your computer.
Asset Tag
Allows you to create a system asset tag if an asset tag is not already set.
This option is not set by default.
SERR Messages
Controls the SERR Message mechanism.
This option is enabled by default.
Some graphics cards require the SERR Message mechanism be disabled.
Image Server
Lookup Method
Specifies how the ImageServer looks for the server address.
Static IP
DNS
NOTE: You must set the Integrated NIC to Enable with ImageServer to set the Lookup Method.
ImageServer IP
Specifies the primary static IP address of the ImageServer with which the client software communicates.
The default IP address is 255.255.255.255
NOTE: You must set the Integrated NIC to Enable with ImageServer to set the ImageServer IP.
ImageServer Port
Specifies the primary IP port of the image server with which the client software communicates.
The default IP port is 06910.
Client DHCP
Specifies how the client obtains the IP address.
Static IP
DHCP (default)
Client IP
Specifies the static IP address of the client.
The default IP address is 255.255.255.255
NOTE: To set the Client IP you must set the Client DHCP to the Static IP
Client SubnetMask
Specifies the subnet mask for the client.
The default setting is 255.255.255.255
NOTE: To set Client Subnet Mask you must set Client DHCP to Static IP
Client Gateway
Specifies the gateway IP address for the client.
The default setting is 255.255.255.255
NOTE: To set Client Subnet Mask you must set Client DHCP to Static IP
License Status
Displays the current license status.
Post Behavior
Fast Boot
When enabled (default), your computer starts more quickly because it skips certain configurations and tests.
NumLock
LED
Enables or disables the NumLock feature when your computer starts.
POST
Hotkeys
Allows you to specify the function keys to display on the screen when the computer starts.
Keyboard
Errors
Enables or disables keyboard error reporting when the computer starts.
MEBx
Hotkey
When enabled (default), this option activates the numeric and mathematical features shown at the top of each key. When disabled, this option activates
the cursor-control functions labeled on the bottom of each key
Enable F2 = Setup (enabled by default)
Enable F12 = Boot menu (enabled by default)
This option is enabled by default.
sign-on displays a message stating the keystroke sequence required to enter the Manageability Engine BIOS Extensions(MEBx) Setup program.
This option is enabled by default.
Set the system maximum memory for OS to load while installation. If enabled the maximum available memory is 256MB RAM.
OS Install
This option is disable by default.
Reason being some operating system will not complete install with more then 2GB of system memory.
System Logs
BIOS Events
Displays the system event log and allows you to:
Clear Log
Mark all Entries
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Cover
Dell™ OptiPlex™ 780 Service Manual—Small Form Factor
WARNING: Before working inside your computer, read the safety information that shipped with your
computer. For additional safety best practices information, see the Regulatory Compliance Homepage at
www.dell.com/regulatory_compliance.
Removing the Cover
1. Follow the procedures in Before Working Inside Your Computer.
2. Slide back the cover release latch.
3. Tilt the system cover from the top outward.
Replacing the Cover
To replace the cover, perform the above steps in reverse order.
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Memory
Dell™ OptiPlex™ 780 Service Manual—Small Form Factor
WARNING: Before working inside your computer, read the safety information that shipped with your
computer. For additional safety best practices information, see the Regulatory Compliance Homepage at
www.dell.com/regulatory_compliance.
Removing the Memory Module(s)
1. Follow the procedures in Before Working Inside Your Computer.
2. Press out on the securing clips on each end of the memory module connector.
3. Lift the memory module out of the connector on the system board and remove.
Replacing the Memory Module(s)
To replace the memory module, perform the above steps in reverse order.
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Floppy Drive
Dell™ OptiPlex™ 780 Service Manual—Small Form Factor
WARNING: Before working inside your computer, read the safety information that shipped with your
computer. For additional safety best practices information, see the Regulatory Compliance Homepage at
www.dell.com/regulatory_compliance.
Removing the Floppy Drive
1. Follow the procedures in Before Working Inside Your Computer.
2. Pull up on the cable release tab to disconnect the floppy-drive data cable from the system board.
3. Pull up on the drive release latch and slide the floppy drive towards the back of the computer.
4. Lift up to the floppy drive and remove it from the computer.
Replacing the Floppy Drive
To replace the floppy drive, perform the above steps in reverse order.
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Expansion Card
Dell™ OptiPlex™ 780 Service Manual—Small Form Factor
WARNING: Before working inside your computer, read the safety information that shipped with your
computer. For additional safety best practices information, see the Regulatory Compliance Homepage at
www.dell.com/regulatory_compliance.
Removing the Expansion Card(s)
1. Follow the procedures in Before Working Inside Your Computer.
2. Push in on the release tab on the card retention latch from the inside to pivot the latch open.
3. If you are removing a PCI-Express x16 video card go to step 4, else go to step 5.
4. Press the lever on the securing tab until you release the securing tab.
5. Grasp the card by it top corners and ease it out of its connector.
Replacing the Expansion Card(s)
To replace the expansion card(s), perform the above steps in reverse order.
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Power Supply
Dell™ OptiPlex™ 780 Service Manual—Small Form Factor
WARNING: Before working inside your computer, read the safety information that shipped with your
computer. For additional safety best practices information, see the Regulatory Compliance Homepage at
www.dell.com/regulatory_compliance.
Removing the Power Supply
1.
2.
3.
4.
Follow the procedures in Before Working Inside Your Computer.
Remove the optical drive.
Remove the floppy drive.
Disconnect the processor power cable from the system board.
5. Remove the processor power cable from the routing guides on the chassis.
6. Press the release latch and disconnect the main power cable from the system board.
7. Remove the screws that secure the power supply to the computer chassis.
8. Slide the power supply towards the front of the computer.
9. Lift the power supply up and out of the computer.
Replacing the Power Supply
To replace the power supply, perform the above steps in reverse order.
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IO Panel
Dell™ OptiPlex™ 780 Service Manual—Small Form Factor
WARNING: Before working inside your computer, read the safety information that shipped with your
computer. For additional safety best practices information, see the Regulatory Compliance Homepage at
www.dell.com/regulatory_compliance.
Removing the IO Panel
1.
2.
3.
4.
Follow the procedures in Before Working Inside Your Computer.
Remove the system board.
Remove the fan.
Press the clips on either sides of the air temperature sensor and remove it from the computer chassis.
5. Remove the mounting screw that secures the IO panel to the computer.
6. Ease the IO panel back and forth to release its circular tabs from the hole in the chassis. Remove the IO panel.
Replacing the IO Panel
To replace the IO panel, perform the above steps in reverse order.
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Coin-Cell Battery
Dell™ OptiPlex™ 780 Service Manual—Small Form Factor
WARNING: Before working inside your computer, read the safety information that shipped with your
computer. For additional safety best practices information, see the Regulatory Compliance Homepage at
www.dell.com/regulatory_compliance.
Removing the Coin-Cell Battery
1. Follow the procedures in Before Working Inside Your Computer.
2. Press in on the coin-cell battery release latch.
3. Remove the coin-cell battery.
Replacing the Coin-Cell Battery
To replace the coin-cell battery, perform the above steps in reverse order.
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Optical Drive
Dell™ OptiPlex™ 780 Service Manual—Small Form Factor
WARNING: Before working inside your computer, read the safety information that shipped with your
computer. For additional safety best practices information, see the Regulatory Compliance Homepage at
www.dell.com/regulatory_compliance.
Removing the Optical Drive
1. Follow the procedures in Before Working Inside Your Computer.
2. Disconnect the power cable from the back of the optical drive.
3. Disconnect the data cable from the back of the optical drive.
4. Pull up on the drive-release latch and slide the optical drive towards the back of the computer.
5. Lift the optical drive up and out of the computer..
\
Replacing the Optical Drive
To replace the optical drive, perform the above steps in reverse order.
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Heat Sink and Processor
Dell™ OptiPlex™ 780 Service Manual—Small Form Factor
WARNING: Before working inside your computer, read the safety information that shipped with your
computer. For additional safety best practices information, see the Regulatory Compliance Homepage at
www.dell.com/regulatory_compliance.
Removing the Heat Sink and Processor
1. Follow the procedures in Before Working Inside Your Computer.
2. Disconnect the floppy-drive data cable from the system board and remove it from the routing guides on the heat sink.
3. Loosen the screws that secure the heat sink to the system board.
4. Rotate the heat sink towards the back of the computer and remove the heat sink.
5. Press processor cover release lever down and out to release the cover.
6. Lift the processor cover.
7. Remove the processor from the system board.
CAUTION: When replacing the processor, do not touch any of the pins inside the socket or allow any
objects to fall on the pins in the socket.
Replacing the Heat Sink and Processor
To replace the heat sink and processor, perform the above steps in reverse order.
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Hard Drive
Dell™ OptiPlex™ 780 Service Manual—Small Form Factor
WARNING: Before working inside your computer, read the safety information that shipped with your
computer. For additional safety best practices information, see the Regulatory Compliance Homepage at
www.dell.com/regulatory_compliance.
Removing the Hard Drive
1. Follow the procedures in Before Working Inside Your Computer.
2. Release the cable tie.
3. Disconnect the data cable from the system board.
4. Press in on the blue securing tabs on each side of the drive chassis and slide the drive chassis up and out of the
computer.
5. Disconnect the hard drive power cable.
6. Disconnect the hard-drive fan cable.
7. Remove the hard-drive chassis from the computer.
8. Disconnect the hard-drive data cable from the hard-drive chassis by pulling on the blue tab.
9. Remove the hard-drive data cable from the outside of the drive chassis.
10. Remove the fan cable from the outside of the hard-drive cage.
11. To release the hard-drive fan, lift up on the blue tab and rotate it counter-clockwise.
12. Remove the hard-drive fan.
13. To release the hard drive from the cage, pull back on the blue tabs and pull forward on the hard drive.
14. Remove the hard drive component from the hard drive chassis.
Replacing the Hard Drive
To replace the hard drive, perform the above steps in reverse order.
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System Board
Dell™ OptiPlex™ 780 Service Manual—Small Form Factor
WARNING: Before working inside your computer, read the safety information that shipped with your
computer. For additional safety best practices information, see the Regulatory Compliance Homepage at
www.dell.com/regulatory_compliance.
Removing the System Board
1.
2.
3.
4.
5.
6.
7.
8.
Follow the procedures in Before Working Inside Your Computer.
Remove the optical drive.
Remove the floppy drive.
Remove the hard drive.
Remove the expansion card(s).
Remove the memory.
Remove the heat sink and processor.
Disconnect the processor power cable from the system board.
9. Disconnect the hard-drive and optical-drive data cables from the system board.
10. Disconnect the main power connector.
11. Remove the IO panel cable from the system board.
12. Disconnect the system-fan cable.
13. Remove the screws that secure the heat-sink retention module to the system board.
14. Remove the heat-sink retention module.
15. Remove the screws that secure the system board to the computer chassis.
16. Remove the system board.
Replacing the System Board
To replace the system board, perform the above steps in reverse order.
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Fan
Dell™ OptiPlex™ 780 Service Manual—Small Form Factor
WARNING: Before working inside your computer, read the safety information that shipped with your
computer. For additional safety best practices information, see the Regulatory Compliance Homepage at
www.dell.com/regulatory_compliance.
Removing the Fan
1. Follow the procedures in Before Working Inside Your Computer.
2. Remove the system board.
3. Remove the diagnostic LED ribbon cable.
4. Press the retaining clip to release the fan from the computer chassis.
5. Tilt the fan forward and remove from the computer chassis.
Replacing the Fan
To replace the fan, perform the above steps in reverse order.
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