5-8 Troubleshooting Procedures
5.3.3.2 POST Beep Error Messages
In the event of a hardware problem that affects the display, the Notebook also
communicates errors via a series of beeps. These codes may be heard over the
system's speaker as three bursts of beeps. The interpretation of the beep codes is
provided in Table 5-3.
To recover from a self test error, try cycling power to the computer. Also, press
Ctrl-Alt-Esc to ensure that the Setup configuration is correct. In general, most of the
failures are associated with the Upper and Lower Electronics Boards and may require
board removal/replacement.

Table 5-2 POST Erro r Messages (conti nued)

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 bac k on
again. If the probl em persists,
contact qualified ser vice
personnel.
Keybo ard 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 pers onnel.
Keyboard stuck key failur e A key is jammed. Locate the jammed key and fix
it. Make sure the keyboard cabl e
and keyboard are connected
properly. Turn the power of f,
then back on again. If t he
problem persists, cont act
qualified service pers onnel.
Memory failure at
hex-
value
, read
hex-value
,
expecting
hex-value
Circuitry associated with the
memory chips has failed. Turn the power off, then bac k on
again. If the probl em persists,
contact qualified ser vice
personnel.
Unexp ected inte r r upt in
protected mode Hardware interrupt or NMI
occurred while in protect ed
mode.
Check the timer chip or the
interrupt contr oller on the
system board.
Real time clock failure The RTC or battery failed. Run SETUP and turn the power
off and on. If t he problem
persists, replace t he RTC
battery. If the problem remains,
contact qualified ser vice
personnel.