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Error messages
Symptom or error FRU or action, in sequence
Device address conflict. 1. Load “Setup Defaults” in
IBM BIOS Setup Utility.
2. Backup battery.
3. System board.
Allocation error for device. 1. Load “Setup Defaults” in
IBM BIOS Setup Utility.
2. Backup battery.
3. System board.
Failing bits: nnnn. 1. DIMM.
2. System board.
Invalid system configuration
data.
1. DIMM.
2. System board.
I/O device IRQ conflict. 1. Load “Setup Defaults” in
IBM BIOS Setup Utility.
2. Backup battery.
3. System board.
Operating system not found. 1. Check that the operating
system has no failure and is
installed correctly.
2. Enter IBM BIOS Setup
Utility and see whether
the hard-disk drive and
the diskette drive are
properly identified.
3. Reseat the hard-disk drive.
4. Reinstall the operating
system.
5. Diskette drive.
6. Hard-disk drive.
7. System board.
Hibernation error. 1. Restore the system
configuration to what it
was before the computer
entered hibernation mode.
2. If memory size has been
changed, re-create the
hibernation file.
Fan error. Fan.
Thermal sensing error. System board.
Symptom-to-FRU index
52 ThinkPad T20, T21, T22, T23 (MT 2647/2648)