5-6 Troubleshooting and Repair
Table 5-2 POST Error Messages
Message
Possible Cause
Action
Keyboard clock line failure
The keyboard, the
keyboard cable
connection, or the
keyboard controller is
defective.
Make sure the keyboard
cable and keyboard are
connected properly. Check
the keyboard controller and
the system board. Turn the
power off, then back on
again. If the problem persists,
contact qualified service
personnel.
Keyboard data line failure
The keyboard controller
firmware has failed.
Check the keyboard
controller and system board.
Turn the power off, then back
on again. If the problem
persists, contact qualified
service personnel.
Keyboard stuck key failure
A key is jammed.
Locate the jammed key and
fix it. Make sure the keyboard
cable and keyboard are
connected properly. Turn the
power off, then back on
again. If the problem persists,
contact qualified service
personnel.
Memory failure at hex-
value, read hex-value,
expecting hex-value
Circuitry associated with
the memory chips has
failed.
Turn the power off, then back
on again. If the problem
persists, contact qualified
service personnel.
Unexpected interrupt in
protected mode
Hardware interrupt or NMI
occurred while in
protected mode.
Check the timer chip or the
interrupt controller on the
system board.
Real time clock failure
The RTC or battery failed.
Run SETUP and turn the
power off and on. If the
problem persists, replace the
RTC battery. If the problem
remains, contact qualified
service personnel.
