Lenovo 5106 Maintenance Manual page 70

Message/Symptom
Incorrect memory size during POST
"Insert a Diskette" icon appears with a known-good
diagnostics diskette in the first 3.5-inch diskette drive.
Intensity or color varies from left to right of characters
and color bars
No power or fan not running
Non-system disk or disk error-type message with a
known-good diagnostic diskette.
Other display symptoms not listed above (including blank
or illegible display)
Power-on indicator or hard disk drive in-use light not on,
but computer works correctly
Printer problems
Program loads from the hard disk with a known-good
diagnostics diskette in the first 3.5-inch diskette drive
PXE computer does not PXE from server
Serial or parallel port device failure (system board port)
Serial or parallel port device failure (adapter port)
Some or all keys on the keyboard do not work
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ThinkCentre Hardware Maintenance Manual
FRU/Action
1. Run the Memory tests.
2. Memory Module
3. System Board
1. System Board
2. Diskette Drive Cable
3. Network Adapter
1. Display
2. Video adapter (if present)
3. System Board
1. See "Hard disk drive boot error" on page 61.
1. Diskette Drive
2. System Board
3. Diskette Drive Cable
1. Display
2. System Board
1. Power switch/LED assembly
2. System Board
1. Printer
2. System Board
1. Run the Setup Utility program and check Startup
sequence.
2. Diskette Drive
3. Diskette Drive Cable
4. System Board
5. Power Supply
1. Check startup sequence.
2. Check the network adapter LED status.
1. External Device Self-Test OK?
2. External Device
3. Cable
4. System Board
1. External Device Self-Test OK?
2. External Device
3. Cable
4. Alternate Adapter
5. System Board
1. Keyboard
2. Keyboard Cable
3. System Board