Ch.4 Troubleshooting. Acer M19A System, Veriton 5200
Acer Veriton 5200 is a powerful and versatile desktop computer that is perfect for both home and office use. With its fast processor, ample memory, and large storage capacity, the Veriton 5200 can handle even the most demanding tasks with ease. It also features a variety of ports and expansion slots, so you can connect all of your essential peripherals and devices.
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Troubleshooting
This chapter provides troubleshooting information for the Veriton 7200:
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Power-On Self-Test (POST
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Index of Error Message
Index of Error Symptoms
Undetermined Problems
Chapter 4
Chapter 4 64
Power-On Self-Test (POST)
Each time you turn on the system, the Power-on Self Test (POST) is initiated. Several items are tested during
POST, but is for the most part transparent to the user.
The Power-On Self Test (POST) is a BIOS procedure that boots the system, initializes and diagnoses the system components, and controls the operation of the power-on password option. If POST discovers errors in system operations at power-on, it displays error messages on screen, generates a check point code at port
80h or even halts the system if the error is fatal.
The main components on the main board that must be diagnosed and/or initialized by POST to ensure system functionality are as follows:
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Microprocessor with built-in numeric co-processor and cache memory subsystem
Direct Memory Access (DMA) controller (8237 module)
Interrupt system (8259 module) or APIC (advance program interrupt controller)
Three programmable timers (system timer and 8254 module)
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ROM subsystem
RAM subsystem
CMOS RAM subsystem and real time clock/calendar with battery backup
Onboard serial interface controller
Onboard parallel interface controller
Embedded hard disk interface and one diskette drive interface
Keyboard and auxiliary device controllers
I/O ports
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Two RS232 serial ports
One parallel port
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One PS/2-compatible mouse port
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OnePS/2-compatible keyboard port
NOTE: When Post executes a task, it uses a series of preset numbers called check points to be latched at
.
port 80h, indicating the stages it is currently running. This latch can be read and shown on a debug board.
The following table describes the BIOS common tasks carried out by POST. Each task is denoted by an unique check point number. For other unique check point numbers that are not listed in the table, refer to the correspoing product service guide.
Post Checkpoints List: The list may vary accordingly depending on your BIOS
Checkpoint
CFh
C0h
C1h
C3h
C5h
0h1
02h
Description
Test CMOS R/W functionality
Early chipset initialization:
-Disable shadow RAM
-Disable L2 cache (socket 7 or below)
-Program basic chipset registers
Detect memory
-Auto-detection of DRAM size, type and ECC.
-Auto-detection of L2 cache (socket 7 or below)
Expand compressed BIOS code to DRAM
Call chipset hook to copy BIOS back to E000 & F000 shadow RAM.
Expand the Xgroup codes locating in physical address 1000:0
Reserved
65 Chapter 4
19h
1Ah
1Bh
1Ch
1Dh
1Eh
1Fh
20h
21h
22h
13h
14h
15h
16h
17h
18h
0Fh
10h
11h
12h
0Bh
0Ch
0Dh
0Eh
.
Checkpoint
03h
04h
05h
06h
07h
08h
09h
0Ah
Description
Initial Superio_Early _Init switch
Reserved
1. Blank out screen
2. Clear CMOS error flag
Reserved
1. Clear 8042 interface
2. Initialize 8042 self-test
1. Test special keyboard controller for Winbond 977 series Super I/O chips.
2. Enable keyboard interface.
Reserved
1. Disable PS/2 mouse interface (optional)
2. Auto detect ports for keyboard & mouse followed by a port & interface swap (optional).
3. Reset keyboard for Winbond 977 series Super I/Q chips.
Reserved
Reserved
Reserved
Test F000h segment shadow to see whether it is R/W-able or not. If test fails, keep beeping the speaker.
Reserved
Auto detect flash type to load appropriate flash R/W codes into the run time area in F000 for ESCD & DMI support.
Reserved
Use walking 1’s algorithm to check out interface in CMOS circuitry. Also set real-time clock power status, and then check for override.
Reserved
Program chipset default values into chipset. Chipset default values are MODBINable by
OEM customers.
Reserved
Initial Early_Init_Onboard_Generator switch.
Reserved
Detect CPU information including brand, SMI type (Cyrix or Intel) and CPU level (586 or
686)
Reserved
Reserved
Initial interrupts vector table. If no special specified, all H/W interrupts are directed to
SPURIOUS_INT_HDLR & S/W interrupts to SPURIOUS_soft_HDLR.
Reserved
Initial Early_PM_INIT switch.
Reserved
Load keyboard matrix (notebook platform)
Reserved
HPM initialization (notebook platform)
Reserved
Chapter 4 66
67
2Ah
2Bh
2Ch
2Dh
24h
25h
26h
27h
28h
29h
3Ah
3Bh
3Ch
3Dh
36h
37h
38h
39h
3Eh
3Fh
40h
41h
42h
32h
33h
34h
35h
2Eh
2Fh
30h
31h
.
Checkpoint
23h
Description
1. Check validity of RTC value:
e.g. a value of 5Ah is an invalid value for RTC minute.
2. Load CMOS settings into BIOS stack. If CMOS checksum fails, use default value
instead.
3. Prepare BIOS resource map for PCI & PnP use. If ESCD is valid, take into
consideration of the ESCD’s legacy information.
4. Onboard clock generator initialization. Disable respective clock resource to empty PCI
& DIMM slots.
5. Early PCI initialization
-Enumerate PCI bus number
-Assign memory & I/O resource
-Search for a valid VGA device and VGA BIOS, and put it into C000:0
Reserved
Reserved
Reserved
Initialize INT 09 buffer
Reserved
1. Program CPU internal MTRR (P6 & PII) for 0-640K memory address.
2. Initialize the APIC for Pentium class CPU.
3. Program early chipset according to CMOS setup. Example: onboard IDE controller.
4. Measure CPU speed.
5. Invoke video BIOS.
Reserved
Reserved
Reserved
1. Initialize multi-language
2. Put information on screen display, including Award title, CPU type, CPU speed...
Reserved
Reserved
Reserved
Reserved
Reserved
Reset keyboard except Winbond 977 series Super I/O chips.
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Test 8254.
Reserved
Test 8259 interrupt mask bits for channel 1
Reserved
Test 8259 interrupt mask bits for channel 2.
Reserved
Reserved
Chapter 4
4Ah
4Bh
4Ch
4Dh
4Eh
58h
59h
5Ah
5Bh
53h
54h
55h
56h
57h
4Fh
50h
51h
52h
5Eh
5Fh
60h
61h
62h
63h
64h
65h
66h
.
Checkpoint
43h
44h
45h
46h
47h
48h
49h
5Ch
5Dh
Description
Test 8259 functionality
Reserved
Reserved
Reserved
Initialize EISA slot
Reserved
1. Calculate total memory by testing the last double word of each 64K page.
2. Program writes allocation for AMD K5 CPU.
Reserved
Reserved
Reserved
Reserved
1. Program MTRR of M1 CPU.
2. Initialize L2 cache for P6 class CPU & program CPU with proper cacheable range.
3. Initialize the APIC for P6 class CPU.
4. On MP platform, adjust the cacheable range to smaller one in case the cacheable
ranges between each CPU are not identical.
Reserved
Initialize USB
Reserved
Test all memory (clear all extended memory to 0)
Reserved
Reserved
Display number of processors (multi-processor platform)
Reserved
1. Display PnP logo
2. Early ISA PnP initialization
-Assign CSN to every ISA PnP device.
Reserved
Initialize the combined Trend Anti-Virus code.
Reserved
(Optional Feature)
Show message for entering AWDFLASH.EXE from FDD(optional)
Reserved
1. Initialize Init_Onboard_Super_IO switch.
2. Initialize Init_Onboard_AUDIO switch.
Reserved
Reserved
Okay to enter Setup utility; i.e. not until this POST stage can users enter the CMOS setup utility.
Reserved
Reserved
Reserved
Reserved
Initialize PS/2 Mouse
Reserved
Chapter 4 68
69
78h
79h
7Ah
7Bh
74h
75h
76h
77h
7Ch
7Dh
7Eh
7Fh
68h
69h
6Ah
6Bh
6Ch
6Dh
.
Checkpoint
67h
6Eh
6Fh
70h
71h
72h
73h
80h
81h
82h
83h
84h
Description
Prepare memory size information for function call:
INT 15h ax=E820h
Reserved
Turn on L2 cache
Reserved
Program chipset registers according to items described in Setup& Auto-configuration table.
Reserved
1. Assign resources to all ISA PnP devices.
2. Auto assign ports to onboard COM ports if the corresponding item in Setup is set to
“AUTO”
Reserved
1. Initialize floopy controller
2. Set up floppy related fields in 40: hardware.
Reserved
Reserved
Reserved
(Optional Feature)
Enter AWDFLASH.EXE if:
-AWDFLASH is found in floppy drive
-ALT+F2 is pressed
Reserved
Detect & install all IDE devices: HDD, LS120, ZIP,CDROM.....
Reserved
Detect serial ports & parallel ports
Reserved
Reserved
Detect & install co-processor
Reserved
Reserved
Reserved
Reserved
1. Switch back to text mode if full screen logo is supported.
-If errors occur, report errors & wait for keys
-If no erros occur or F1 key is pressed to continue:
Clear EPA or customization logo.
Reserved
Reserved
1. Call chipset power management hook.
2. Recover the text fond used by EPA logo (not for full screen logo)
3. If password is set, ask for password.
Save all data in stack back to CMOS.
Initialize ISA PnP boot devices.
Chapter 4
90h
91h
92h
93h
94h
86h
87h
88h
89h
.
Checkpoint
85h
95h
96h
FFh
1. USB final Initialization
2. NET PC: Build SYSID structure
3. Switch screen back to text mode.
4. Set up ACPI table at top of memory.
5. Invoke ISA adapter ROMs.
6. Assign IRQs to PCI devices
7. Initialize APM
8. Clear noise of IRQs/
Description
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Read HDD boot sector information for Trend Anti-Virus code
1. Enable L2 cache
2. Program boot up speed
3. Chipset final initialization
4. Power management final initialization
5. Clear screen & display summary table
6. Program K6 write allocation
7 Program P6 class write combining .
1. Program daylight saving
2. Update keyboard LED & typematic rate
1. Build MP table
2. Build & update ESCD
3. Set CMOS century to 20h or 19h
4. Load CMOS time into DOS timer tick
5. Build MSIRQ routing table
Boot attempt (INT 19h)
Chapter 4 70
POST Error Messages List
If you cannot run the diagnostics program tests but did receive a POST error message, use “POST Error
Messages List” to diagnose system problems. If you did not receive any error message, look for a description
of your error symptoms in “Error Symptoms List” on page 73
.
NOTE: When you have deemed it necessary to replace an FRU, and have done so, you must run a total system check to ensure that no other activity has been affected by the change. This system check can be done through the diagnostics program.
NOTE: Check all power supply voltages, switch, and jumper settings before you replace the main board. Also check the power supply voltages if you have a “system no-power” condition.
If you are unable to correct the problem by using the “BIOS Messages List” table and “Error Symptoms List”
table, go to “Undetermined Problems” on page 77.
To diagnose a problem, first find the BIOS error messages in the left column. If directed to a check procedure, replace the FRU indicated in the check procedure. If no check procedure is indicated, the first Action/FRU listed in right column is the most likely cause.
BIOS Messages
CMOS Battery Bad
CMOS Checksum Error
Disk Boot Failure
71
Diskette Drives or Types Mismatch Error
Display Switch Is Set Incorrectly
Display Type Has Changed Since Last Boot
Error Encountered Initializing Hard Drive
Error Encountered Initializing Hard Disk Controller
Floopy Disk CNTRLR Error or No CNTRLR Present
Keyboard Error or No Keyboard Present
Memory Address Error
Memory Parity Error
Action/FRU
Battery should be replaced
Check the battery and replace if necessary.
Insert system disk into Drive (A:)and press e
.
NOTE: If you assumed the system would boot from the hard drive, make sure the controller is inserted correctly and all cables are properly attached. Also be sure the disk is formatted as a boot device. Then reboot the system.
Run Setup
Determine which setting is correct, and then either turn off the system and change the jumper, or enter Setup and change the VIDEO selection.
Configure the system for the new display type/
Be sure the adapter is installed correctly and all cables are correctly and firmly attached. Also be sure the correct hard drive type is selected in Setup.
Make sure the cord is correctly and firmly installed in the bus. Be sure the correct hard drive type is selected in
Setup. Also check if any jumper needs to be set correctly on the hard drive.
Make sure the controller is installed correctly and firmly. If there are no floppy drives installed, be sure the Diskette
Drive selection in Setup is set to None.
Make sure the keyboard is attached correctly and no keys are pressed during the boot.
NOTE: If you are purposely configuring the system without a keyboard, set the error halt condition in Setup to HALT ON ALL,
BUT KEYBOARD.This will cause BIOS to ignore the missing keyboard and continue the boot.
Use this location along with the memory map for your system to find and replace the bad memory chips.
Use this location along with the memory map for your system to find and replace the bad memory chips.
Chapter 4
BIOS Messages
Memory Size Has Changed Since Last Boot
Memory Verify Error
Offending Address Not Found
Offending Segment
Press A Key To Reboot
Press F1 to Disable NMI, F2 to Reboot
RAM Parity Error
System Halted
Floppy Disk(s) Fail(80)
Floppy Disk(s) Fail (40)
Hard Disk(s) Fail (80)
Hard Disk(s) Fail (40)
Hard Disk(s) Fail (20)
Hard Disk(s) Fail (10)
Hard Disk(s) Fail (08)
Keyboard Is Locked Out
Keyboard Error Or No Keyboard Present
Manufacturing POST loop
BIOS ROM Checksum Error
Memory Test Fail
Action/FRU
In EISA mode, use Configuration Utility to reconfigure the memory configuration. In ISA mode, enter Setup and enter the new memory size in the memory fields.
Use this location along with your system’s memory map to locate hte bad chip.
This message is used in conjunction with the I/O
CHANNEL CHECK and RAM PARITY ERROR messages when the segment that has caused problem cannot be isolated.
This message is used in conjunction with the I/O
CHANNEL CHECK and RAM PARITY ERROR messages when the segment that has caused problem cannot be isolated.
Press any key and the system will reboot.
When the BIOS detects a Non-maskable Interrupt condition during boot, this will allow you to disable the NMI and continue to boot, or you can reboot the system with the
NMI enabled.
Checking for segment
Press CTRL + ALT + DEL to reboot.
Or plug out AC and wait for 10 seconds, then plug in AC again. Press power button to boot the system again. .
Unable to reset floppy subsystem
Floopy Type mismatch
HDD reset failed
HDD controller diagnostics failed
HDD initialization error
Unable to recalibrate fixed disk
Sector Verify failed
Unlock the key
Make sure the keyboard is attached correctly and no keys are pressed during the boot.
System will repeat POST procedure infinitely while the P15 of keyboard controller is pull low. This is also used for M/B burn in test.
BIOS will boot from the boot block and read BIOS binarry file from FDD disk, then flash BIOS ROM (FWH - Firmware
Hub).
BIOS reports the memory test fail if the onboard memory is tested error
Chapter 4 72
Error Symptoms List
NOTE: To diagnose a problem, first find the error symptom in the left column. If directed to a check procedure,
replace the FRU indicated in the check procedure. If no check procedure is indicated, the first Action/
FRU listed in right column is the most likely cause.
73
Error Symptom Action/FRU
Processor / Processor Fan
NOTE: Normally, the processor fan should be operative, and the processor clock setting should be exactly set to match its speed requirement before diagnosing any processor problems.
Processor fan does not run but power supply fan runs.
Processor test failed.
1. Ensure the system is not in power saving mode. See “Power
Management” in chapter 2.
2. With the system power on, measure the voltage of processor fan connector. Its reading should be +12Vdc. Its reading should be
+12Vdc. If the reading shows normal, but the fan still does not work, then replace a good fan.
3. Main board .
1. Processor.
2. Main board .
Main board and Memory
NOTE: Ensure the memory modules are installed properly and the contact leads are clean before diagnosing any system problems.
Memory test failed.
Incorrect memory size shown or repeated during POST.
System works but fails to enter power saving mode when the Power Management Mode is set to Enabled .
Blinking cursor only; system does not work.
1. See "Memory"
2. Main board
1. Insert the memory modules in the DIMM sockets properly, then reboot the system.
2. Memory module.
3. Main board.
1. Enter BIOS Setup and load default settings.
In Windows Systems, check settings in Power Management
Property of Control Panel.
2. Reload software from Recovery CD.
1. Diskette/IDE drive connection/cables
2. Diskette/IDE disk drives
3. See “Undetermined Problems”.
4. Main board
Diskette Drive
NOTE: Ensure the diskette drive is auto-setting in BIOS Setup and its read/write head is clean before diagnosing any diskette drive problems.(If only one drive is installed, please make sure the drive is connected to master connector or the drive is set to master.)
Media and drive are mismatched.
Diskette drive does not work.
Diskette drive read/write error.
1. Ensure the diskette drive is configured correctly in the Disk
Drives of BIOS Setup.
2. Ensure the diskette drive is correctly formatted.
3. Diskette drive connection/cable
4. Diskette drive
5. Main board
1. Ensure the diskette drive is not set to None in the Disk Drives of
BIOS Setup.
2. Diskette drive power
3. Diskette drive connection/cable
4. Diskette drive
5. Main board
1. Diskette.
2. Ensure the diskette drive is not set to Write protect in the
Security Options of BIOS Setup.
3. Diskette drive cable.
4. Diskette drive.
5. Main board.
Chapter 4
Error Symptom
Diskette drive LED comes on for more than 2 minutes when reading data.
Diskette drive LED fails to light, and the drive is unable to access for more than 2 minutes.
Action/FRU
1. Diskette
2. Diskette drive connection/cable
3. Diskette drive
4. Main board
1. Diskette
2. Diskette drive power
3. Diskette drive connection/cable
4. Diskette drive
5. Main board
Diskette drive test failed.
1. Diskette
2. Diskette drive
3. Diskette drive cable
4. Main board
Hard Disk Drive
NOTE: Ensure hard disk drive is configured correctly in BIOS Setup, cable/jumper are set correctly before diagnosing any hard disk drive problems. (If only one drive is installed, please make sure the drive is connected to master connector or the drive is set to master.)
Hard disk drive test failed.
Hard disk drive cannot format completely.
Hard disk drive has write error.
Hard disk drive LED fails to light, but system operates normally.
1. Enter BIOS Setup and Load default settings.
2. Hard disk drive cable.
3. Hard disk drive.
4. Main board.
1. Enter BIOS Setup and Load default settings.
2. Hard disk drive cable.
3. Hard disk drive.
4. Main board.
1. Enter BIOS Setup and Load default settings.
2. Hard disk drive.
1. With the system power on, measure the voltage of hard disk LED connector.
2. Hard drive LED cable.
CD/DVD-ROM Drive
NOTE: Ensure CD/DVD-ROM drive is configured correctly in BIOS Setup, cable/jumper are set correctly and its laser beam is clean before diagnosing any CD/DVD-ROM drive problems.
1. CD/DVD-ROM drive CD/DVD-ROM drive LED doesn't come on but works normally.
CD/DVD-ROM drive LED flashes for more than 30 seconds before LED shutting off.
1. CD/DVD-ROM may have dirt or foreign material on it. Check with a known good disc.
2. CD/DVD-ROM is not inserted properly.
3. CD/DVD-ROM is damaged.
Software asks to reinstall disc.
Software displays a reading CD/DVD error.
CD/DVD-ROM drive cannot load or eject when the system is turned on and its eject button is pressed and held.
CD/DVD-ROM drive does not read and there are no messages are displayed.
CD/DVD-ROM drive can play audio CD but no sound output.
Real-time clock is inaccurate.
1. Disconnect all cables from CD/DVD-ROM drive except power cable, then press eject button to try to unload the disk.
2. CD/DVD-ROM drive power.
3. CD/DVD-ROM drive
1. CD may have dirt or foreign material on it. Check with a known good disc.
2. Ensure the CD/DVD-ROM driver is installed properly.
3. CD/DVD-ROM drive.
1. Ensure the headphone jack of the CD/DVD-ROM has an output.
2. Turn up the sound volume.
3. Speaker power/connection/cable.
4. CD/DVD-ROM drive.
Real-Time Clock
1. Ensure the information in the Date and Time of BIOS Setup is set correctly.
2. RTC battery.
3. Main board
Chapter 4 74
75
Error Symptom Action/FRU
Audio
1. Speaker power/connection/cable.
Audio software program invokes but no sound comes from speakers.
Modem ring cannot wake up system from suspend mode.
Data/fax modem software program invokes but cannot receive/send data/fax
Fax/voice modem software program invokes but has no sound output. (Data files are received normally; voice from modem cannot be produced, but system sound feature works normally.)
Modem
1. For the External Modem, make sure Power on By Ring in BIOS
Setup or Power Management is set to Enabled. For the PCI modem, make sure Wake up by PCI card is set to Enabled.
2. If PCI modem card is used, reinsert the modem card to PCI slot firmly or replace the modem card.
3. In Win 98, ensure the telephone application is configured correctly for your modem and set to receive messages and/or fax.
1. Ensure the modem card is installed properly.
1. Ensure the modem voice-in cable from modem adapter card to main board
Video memory test failed.
Video adapter failed.
Display problem:
- Incorrect colors
No high intensity
Missing, broken, or incorrect characters
Blank monitor(dark)
Blank monitor(bright)
Distorted image
Unreadable monitor
Other monitor problems
Display changing colors.
Video and Monitor
1. Remove all non-factory-installed cards.
2. Load default settings (if screen is readable).
3. Main board
1. Monitor signal connection/cable.
2. Monitor
3. Video adapter card
4. Main board
Display problem not listed above (including blank or illegible monitor).
1. Monitor signal connection/cable
2. Monitor
3. Main board
1. “Monitor".
2. Load default settings (if screen is readable).
3. Main board
Chapter 4
Error Symptom Action/FRU
Parallel/Serial Ports
Execute “Load BIOS Default Settings” in BIOS Setup to confirm ports presence before diagnosing any parallel/serial ports problems.
Serial or parallel port loop-back test failed.
Printing failed.
Printer problems.
Some or all keys on keyboard do not work.
Pressing power switch does not turn off system. (Only unplugging the power cord from electrical outlet can turn off the system.)
Pressing power switch does not turn on the system.
1. Make sure that the LPT# or COM# you test is the same as the setting in BIOS Setup.
2. Loop-back.
3. Main board.
1. Ensure the printer driver is properly installed. Refer to the printer service manual.
2. Printer.
3. Printer cable.
4. Main board.
1. Refer to the service manual for the printer.
Keyboard
1. Keyboard
Power Supply
1. Ensure the Power Switch < 4 sec. in BIOS Setup of Power
Management is not set to Instant-off.
2. Power switch cable assembly
1. Ensure the power override switch (situated at the back of the machine, just above the connector for the power cable) is not set to OFF.
2. Power switch cable assembly.
1. Load default settings.
2. Reload software from Recovery CD.
Executing software shutdown from
Windows98 Start menu does not turn off the system. (Only pressing power switch can turn off the system).
No system power, or power supply fan is not running.
Any other problems.
1. Power Supply
2. Main board
Other Problems
1. Undetermined Problems
Chapter 4 76
Undetermined Problems
problem, continue with this check:
1.
Check the power supply voltages. If the voltages are correct continue with the following steps:
2.
Power off the system unit.
3.
Perform the following checks, one by one, until you have isolated the problem FRU.
4.
Load default settings in setup.
5.
Check all main board jumper positions and switch settings.
6.
Check all adapter card jumper positions.
7.
Check all device jumper positions.
8.
Check all cables and connectors for proper installation.
9.
If the jumpers, switches and voltage settings are correct, remove or disconnect the following, one at a time:
10. Non-Acer devices
!
!
!
!
External devices
Any adapter card (modem card, LAN card or video card, if installed)
CD/DVD-ROM drive
Diskette drive
!
!
Hard disk drive
DIMM
!
Processor
!
Main board
11. Power on the system unit.
12. Repeat steps 2 through 5 until you find the failing device or adapter.
77 Chapter 4

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Key features
- Powerful processor for fast performance
- Ample memory for multitasking and running demanding applications
- Large storage capacity for storing all of your files and programs
- Variety of ports and expansion slots for connecting peripherals and devices
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