Compaq 1200US - Presario - Celeron 800 MHz Maintenance And Service Manual page 15

Before You Begin
Removal Sequence
Product Description
Power-On Self Test (POST)
Running POST
To run POST, complete the following steps:
Turn off the computer, then turn on the computer.
If POST does not detect any errors, the computer will not beep. This indicates successful
completion of 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
NOTE:
well enough to show 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
Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252
Power-On Self-Test Messages
102-System Board Failure
162-System Options Not Set
XX000YZZ 201-Memory Error
304-Keyboard or System Unit Error
601-Diskette Controller Error
605-Diskette Drive Error
1780-Primary Hard Drive 0 Failure
1782-Hard Drive Controller
Presario 1200 Series
Specifications
Troubleshooting
Pin Assignments
Recommended Action
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.
Recommended Action
1. Replace the keyboard.
2. Replace the TouchPad or mouse.
3. Replace the system board.
Recommended Action
1. Run Computer Checkup (TEST).
2. Check and/or replace cables.
3. Replace the system board.
Recommended Action
Run Computer Setup.
Recommended Action
1. Run Computer Checkup (TEST).
2. Replace the hard drive.
1. Run Computer Checkup (TEST).
2. Replace the hard drive.
Recommended Action
1. Run Computer Setup.
2. Replace the hard drive.
Parts Catalog
Battery Operations
Index
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.