HP Compaq d220 MT Reference Manual page 78

POST Error Messages
POST Error Messages
Screen Message
CMOS Checksum Bad
Keyboard Error
Keyboard/Interface
Error
C–4
Probable Cause
CMOS contents failed
the Checksum check.
Keyboard not present or
system not responding
when keyboard controller
is initialized.
Keyboard controller
failure.
336493-004
Recommended Action
Restart the computer, use the F10 Key to
access Computer Setup. Select Load
Default Settings > Save and Exit.
Reconnect keyboard with computer
turned off.
Check connector for bent or missing
pins.
Ensure that none of the keys are
depressed.
Replace keyboard.
Replace system board.
Reconnect keyboard with computer
turned off.
Check connector for bent or missing
pins.
Ensure that none of the keys are
depressed.
Replace keyboard.
Replace system board.
Service Reference Guide, d200