IBM MT 2631, A21M, A22P, A22M, A21P, A20M manual Beep symptoms

		Symptom-to-FRU index
Beep symptoms
Symptom or error	FRU or action, in sequence
One beep and a blank,	1.	Reseat the LCD
unreadable, or flashing LCD.		connector.
	2.	LCD assembly.
	3.	External CRT.
	4.	System board.
One long and two short beeps,	1.	System board.
and a blank or unreadable	2.	LCD assembly.
LCD.	3.	DIMM.
Two short beeps with error	POST error. See “Numeric
codes.	error codes” on page 49.
Two short beeps with blank	1.	System board.
screen.	2.	DIMM.
Two or more beeps, or a	If a mini-PCI Ethernet card is
continuous beep. Operating	installed, confirm that Alert On
System starts successfully.	LAN 2 in IBM BIOS Setup
	Utility is disabled.
Three short beeps, pause,	1.	DIMM.
three more short beeps, and	2.	System board
one short beep.
Only cursor appears.	Reinstall operating system.
No beep symptoms
Symptom or error	FRU or action, in sequence
No beep, power-on indicator	1.	Make sure that every
on, LCD blank, and no POST.		connector is connected
		tightly and correctly.
	2.	DIMM.
	3.	System board.
No beep, power-on indicator	1.	Reseat DIMM.
on, and LCD blank during	2.	System board.
POST.
The power-on password	A power-on password or a
prompt.	supervisor password is set.
	Type the password and press
	Enter.
The hard-disk password	A hard-disk password is set.
prompt.	Type the password and press
	Enter.
The DOS full screen looks	Start the ThinkPad
smaller.	Configuration program and set
	the Screen expansion
	function.

ThinkPad A20m/p, A21m/p and A22m/p 53