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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 49.
Two short beeps and a blank
screen.
1. System board.
2. DIMM.
Two or more beeps, or a
continuous beep. Operating
system starts successfully.
If a mini-PCI Ethernet card is
installed, confirm that Alert On
LAN 2 in IBM BIOS Setup
Utility is disabled.
Three short beeps, pause,
three more short beeps, and
one short beep.
1. DIMM.
2. System board
One short beep, pause, three
short beeps, pause, three more
short beeps, and one short
beep.
Only cursor appears. 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.
The power-on password prompt
appears.
A power-on password or a
supervisor password is set.
Type the password and press
Enter.
The hard-disk password prompt
appears.
A hard-disk password is set.
Type the password and press
Enter.
The DOS full screen looks
smaller.
Start the ThinkPad
Configuration program and set
the Screen expansion
function.
Symptom-to-FRU index
ThinkPad T20, T21, T22 and T23 series 53