Lenovo 2808DKU, 28155YU, 28155XU manual Beep symptoms, No-beepsymptoms

Beep symptoms

Table 4. Beep symptoms

Symptom or error	FRU or action, in sequence
One beep and a blank, unreadable, or	1.	Reseat the LCD connector.
flashing LCD.	2.	LCD assembly.
	3.	External CRT.
	4.	System board.
One long and two short beeps, and a blank	1.	System board.
or unreadable LCD.	2.	LCD assembly.
	3.	DIMM.
Two short beeps with error codes.	POST error. See “Numeric error codes” on
	page 61.
Two short beeps and a blank screen.	1.	System board.
	2.	DIMM.
Three short beeps, pause, three more short	1.	DIMM.
beeps, and one short beep.	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	System board (security chip)
screen.
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,	1.	Make sure that every connector is
and no POST.		connected tightly and correctly.
	2.	DIMM.
	3.	System board.
No beep, power-on indicator on, and LCD	1.	Reseat DIMM.
blank during POST.
	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.

66ThinkPad T400s Hardware Maintenance Manual