5-6 Troubleshooting and Repair
Table 5-2 POST Error Messages (cont’d) Message Possible Cause Action
Keyboard clock line failure The ke
y
board, the
ke
y
board cable
connection, or the
ke
y
board controller is
defective.
Make sure the ke
y
board
cable and ke
y
board are
connected properl
y
. Check
the ke
y
board controller and
the s
y
stem board. Turn the
power off, then back on
a
g
ain. If the problem persists,
contact qualified service
personnel.
Keyboard data line failure The ke
y
board controller
firmware has failed. Check the ke
y
board
controller and s
y
stem board.
Turn the power off, then back
on a
g
ain. If the problem
persists, contact qualified
service personnel.
Keyboard stuck key failure A key is jammed. Locate the jammed ke
y
and
fix it. Make sure the ke
y
board
cable and ke
y
board are
connected properl
y
. Turn the
power off, then back on
a
g
ain. If the problem persists,
contact qualified service
personnel.
Memory failure at
hex-
value
, read
hex-value
,
expecting
hex-value
Circuitr
y
associated with
the memor
y
chips has
failed.
Turn the power off, then back
on a
g
ain. If the problem
persists, contact qualified
service personnel.
Unexpected interrupt in
protected mode Hardware interrupt or NCI
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
RT. batter
y
. If the problem
remains, contact qualified
service personnel.
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