Compaq Presario 1800T Maintenance And Service Manual page 25

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Power-On Self Test (POST)
Running POST
To run POST, complete these directions:
Turn off the computer, then turn on the computer. As soon as the Compaq logo appears press the ESC key to clear the logo
and display the POST messages as they occur.
If POST does not detect any errors, the computer will not beep. This indicates successful completion of the POST test. POST
has run successfully and boots from the hard drive (or from a bootable diskette if one is installed in the diskette drive).
If POST detects errors, the errors are indicated by screen and/or audible messages. Refer to "Power-On Self-Test (POST)
Codes" in the tables for a list of POST codes and their relevant descriptions.
If the system is not functioning well enough to run POST, or if the display is not functioning well enough to show
NOTE:
POST error messages, refer to the Troubleshooting tables.
Probable Cause
DMA, timers, etc.
Probable Cause
Configuration incorrect
CMOS reflects that an invalid
configuration has been set.
RAM failure
Memory test data error
XX000YZZ RAM failure
Probable Cause
Probable Cause
Keyboard failure
Probable Cause
Keyboard or system board error
Probable Cause
Mismatch in drive type or failure in the diskette
controller
Probable Cause
Mismatch in drive type
Probable Cause
Disk 0 failed to respond
Hard drive format error
Probable Cause
Hard drive controller failure
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Maintenance & Service Guide
Presario 1800 Series
Models: 1825 and 1800T
Pin Assignments | Battery Pack Operations
Power-On Self-Test Messages
102-System Board Failure
162-System Options Not Set
XX000YZZ 201-Memory Error
Recommended Action
1. Replace the memory modules.
2 Replace the system board.
301-Keyboard Error
Recommended Action
1. Ensure the keys are not depressed during POST.
2. Reconnect the keyboard with the computer off.
3. Replace the keyboard.
304-Keyboard or System Unit Error
Recommended Action
1. Replace the keyboard.
2. Replace the TouchPad or mouse.
3. Replace the system board.
601-Diskette Controller Error
Recommended Action
1. Run Computer Checkup (TEST).
2. Check and/or replace cables.
3. Replace the system board.
605-Diskette Drive Error
Recommended Action
Run Computer Setup.
1780-Primary Hard Drive 0 Failure
Recommended Action
1. Run Computer Checkup (TEST).
2. Replace the hard drive.
1. Run Computer Checkup (TEST).
2. Replace the hard drive.
1782-Hard Drive Controller
Recommended Action
1. Run Computer Setup.
2. Replace the hard drive.
Recommended Action
Replace the system board.
Recommended Action
Run Computer Setup.
Run Computer Setup.
1. Replace the memory modules.
2. Replace the system board.
1. Replace the memory modules.
2. Replace the system board.
Replace the system board.