Beep Symptoms; No-Beep Symptoms - IBM ThinkPad T21 Hardware Maintenance Manual

Beep symptoms

Symptom or error
One beep and a blank,
unreadable, or flashing LCD.
One long and two short beeps,
and a blank or unreadable
LCD.
Two short beeps with error
codes.
Two short beeps and a blank
screen.
Two or more beeps, or a
continuous beep. Operating
system starts successfully.
Three short beeps, pause,
three more short beeps, and
one short beep.
One short beep, pause, three
short beeps, pause, three more
short beeps, and one short
beep.
Only cursor appears.

No-beep symptoms

Symptom or error
No beep, power-on indicator
on, LCD blank, and no POST.
No beep, power-on indicator
on, and LCD blank during
POST.
The power-on password prompt
appears.
The hard-disk password prompt
appears.
The DOS full screen looks
smaller.
ThinkPad T20, T21, T22 and T23 series
Symptom-to-FRU index
FRU or action, in sequence
1. Reseat the LCD
connector.
2. LCD assembly.
3. External CRT.
4. System board.
1. System board.
2. LCD assembly.
3. DIMM.
POST error. See "Numeric
error codes" on page 49.
1. System board.
2. DIMM.
If a mini-PCI Ethernet card is
installed, confirm that Alert On
LAN 2 in IBM BIOS Setup
Utility is disabled.
1. DIMM.
2. System board
Reinstall operating system.
FRU or action, in sequence
1. Make sure that every
connector is connected
tightly and correctly.
2. DIMM.
3. System board.
1. Reseat DIMM.
2. System board.
A power-on password or a
supervisor password is set.
Type the password and press
Enter.
A hard-disk password is set.
Type the password and press
Enter.
Start the ThinkPad
Configuration program and set
the Screen expansion
function.
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