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3-4 Dell Latitude LM Systems Service Manual
Keyboard error Keyboard not respond-
ing correctly.
Built-in keyboard:
Faulty keyboard or key
pressed while com-
puter booting.
External keyboard:
Cable or connector
loose. Faulty keyboard
or key pressed while
computer booting.
Operating system
not found
Operating system can-
not be found on hard-
disk drive or on diskette
in diskette drive.
Incorrect drive
configuration. Operat-
ing system not installed
on hard-disk drive or
diskette drive not
bootable. Faulty con-
nections. Faulty drive.
Faulty main board.
Parity check 1
nnnn
Parity error in system
bus at address nnnn.
Faulty main board.
Parity check 2
nnnn
Parity error in I/O bus
at address nnnn.
Faulty main board.
Real time clock
error
CMOS battery that
supports data stored in
NVRAM may be dead.
Faulty battery. Faulty
main board.
Shadow RAM
failed at off-
set:
nnnn
Shadow RAM failed at
address nnnn.
Faulty or improperly
seated memory mod-
ule. Faulty main board.
System battery
is dead—Replace
and run Setup
CMOS battery dead. Faulty CMOS battery
or main board.
System cache
error—cache
disabled
Primary cache failed. Faulty microprocessor.
Table 3-2. System Error Messages
(Continued)
Message Definition Probable Causes