IBM ThinkPad T20, Hardware Maintenance Manual

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Symptom-to-FRU index
Symptom or error FRU or action, in
sequence
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. Diskette drive.
4. Hard-disk drive.
5. 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.
Beep symptoms
Symptom or error FRU or action, in
sequence
One beep and a blank,
unreadable, or flashing LCD 1. Reseat the LCD
connector.
2. LCD assembly.
3. External CRT.
4. System board.
One long and two short
beeps, and a blank or
unreadable LCD 1. System board.
2. LCD assembly.
3. DIMM.
Two short beeps with error
codes POST error. See
“Numeric error codes” on
page 39.
Two short beeps with blank
screen 1. System board.
2. DIMM.
Three short beeps, pause,
three more short beeps, and
one short beep. 1. DIMM.
2. System board
Only cursor appears Reinstall operating
system.
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ThinkPad T20 HMM