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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 44.
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.
LCD-related symptoms
Important: The TFT LCD for the notebook computer contains many thin-film
transistors (TFTs). The presence of a small number of dots that are
missing, discolored, or always lighted is characteristic of TFT LCD
technology, but excessive pixel problems can cause viewing concerns.
The LCD should be replaced if the number of missing, discolored, or
lighted dots in any background is as follows:
Minimum quantity of defective pixels required for LCD replacement on June 2006 or later
manufactured ThinkPad
Symptom-to-FRU index
ThinkPad Z61t 49