Dell LM P-133ST manual Parity error in system Faulty main board

Table 3-2. System Error Messages (Continued)

Message	Definition	Probable Causes
Keyboard error	Keyboard not respond-	Built-in keyboard:
	ing correctly.	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	Parity error in system	Faulty main board.
nnnn	bus at address nnnn.
Parity check 2	Parity error in I/O bus	Faulty main board.
nnnn	at address nnnn.
Real time clock	CMOS battery that	Faulty battery. Faulty
error	supports data stored in	main board.
	NVRAM may be dead.
Shadow RAM	Shadow RAM failed at	Faulty or improperly
failed at off-	address nnnn.	seated memory mod-
set: nnnn		ule. Faulty main board.
System battery	CMOS battery dead.	Faulty CMOS battery
is dead—Replace		or main board.
and run Setup
System cache	Primary cache failed.	Faulty microprocessor.
error—cache
disabled

3-4 Dell Latitude LM Systems Service Manual