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C–4 431672-001 Service Reference Guide
POST Error Messages
CMOS Checksum Bad CMOS contents failed the
Checksum check.
Restart the computer, use the F10 Key to
access Computer Setup. Select Load
Default Settings > Save and Exit.
Keyboard Error Keyboard not present or
system not responding
when keyboard controller
is initialized.
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.
Keyboard/Interface
Error
Keyboard controller
failure.
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.
POST Error Messages
Screen Message Probable Cause Recommended Action