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Message/Symptom FRU/Action
Incorrect memory size during POST
1. Run the Memory tests.
2. Memory Module
3. System Board
"Insert a Diskette" icon appears with a known-good
diagnostics diskette in the rst 3.5-inch diskette drive.
1. System Board
2. Diskette Drive Cable
3. Network Adapter
Intensity or color varies from left to right of characters
and color bars
1. Display
2. Video adapter (if present)
3. System Board
No power or fan not running
1. See “Hard disk drive boot error” on page 61.
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 rst 3.5-inch diskette drive
1. Run the Setup Utility program and check Startup
sequence.
2. Diskette Drive
3. Diskette Drive Cable
4. System Board
5. Power Supply
PXE computer does not PXE from server
1. Check startup sequence.
2. Check the network adapter LED status.
Serial or parallel port device failure (system board port) 1. External Device Self-Test OK?
2. External Device
3. Cable
4. System Board
Serial or parallel port device failure (adapter port) 1. External Device Self-Test OK?
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
64 ThinkCentre Hardware Maintenance Manual