Lenovo ThinkPad T400s, Hardware Maintenance Manual

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Beep symptoms
Table 4. 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 62.
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
Table 5. 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 .
Related service information
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