Lenovo 18714AU, Hardware Maintenance Manual

Page: 70 / 254

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 58.
Two short beeps and a blank
screen.
1. System board .
2. DIMM.
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 the cursor appears. Reinstall the operating
system .
Four cycles of four short beeps
and a blank screen.
System board (security chip)
Five short beeps and a blank
screen.
System board
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 than it should.
Start the ThinkPad
Configuration program and set
the Screen expansion
function.
Symptom-to-FRU index
64
MT 2668/2669/2678/2679/2686/2687