Message/Symptom FRU/Action
Non-system disk or disk error-type message
with a known-good diagnostic diskette. 1. Diskette Drive
2. System Board
3. Diskette Drive Cable
Other display symptoms not listed above
(including blank or illegible display) 1. Display
2. System Board
Power-on indicator or hard disk drive in-use
light not on, but computer works correctly 1. Power switch/LED assembly
2. System Board
Printer problems 1. Printer
2. System Board
Program loads from the hard disk with a
known-good diagnostics diskette in the first
3.5-inch diskette drive
1. Run Setup and check Startup sequence.
2. Diskette Drive
3. Diskette Drive Cable
4. System Board
5. Power Supply
RPL computer cannot access programsfrom
its own hard disk. 1. If network administrator is using
LCCM Hybrid RPL, check startup
sequence:
a. First device - network
b. Second device - hard disk
2. Hard disk drive
RPL computer does not RPLfrom server 1. Checkstartup sequence
2. Check the network adapter LED status
Serial or parallel port device failure (system
board port) 1. External Device Self-TestOK?
2. External Device
3. Cable
4. System Board
Serial or parallel port device failure (adapter
port) 1. External Device Self-TestOK?
2. External Device
3. Cable
4. Alternate Adapter
5. System Board
Some or all keys on the keyboard do not
work 1. Keyboard
2. Keyboard Cable
3. System Board
Undetermined problems

If this computer has a parallel ATAhard disk drive, make sure that the hard disk

drive is jumpered as a master and the optical drive is jumpered as a slave.

1. Power-off the computer.

2. Remove or disconnect the following components (if installed) one at a time.

a. External devices (modem, printer, or mouse)

b. Any adapters

82 HardwareMaintenance Manual