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Hibernation error
1. Restore the system
configuration to what it
was the before the
computer entered
hibernation mode.
2. If memory size has been
changed, re-create the
hibernation file.
Operating system not found
1. Reseat the hard disk
drive.
2. Check the boot sequence
by use of IBM BIOS Setup
Fan error
1. 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. System board.
One long and two short beeps,
and a blank or unreadable LCD
1. System board.
2. LCD assembly.
Two short beeps with error
codes
POST error. See “Numeric
error codes” on page 48
Two short beeps with blank
screen
1. System board.
Only cursor appears
1. Reinstall operating
system.
No beep symptoms
Symptom or error FRU or action, in sequence
No beep, power-on indicator
on, LCD blank, and no POST
1. Make sure that every
connector is connected
tightly and correctly.
2. DIMM.
3. System board.
No beep, power-on indicator
on, and LCD blank during
POST
1. Reseat DIMM.
2. System board.
No beep during POST, but
system runs correctly
1. Speaker.
Chapter 3. ThinkPad X20, X21, X22, X23, X24 51