Startup

If you cannot isolate the cause of a problem using the above diagnostic tools, use the suggestions in the following table to help find the problem.

Table 3-3. Troubleshooting Suggestions

Symptom

Call Center: Suggestions

Repair Center: Likely Causes

Repair Center: Comments

To help determine likely causes of a problem, determine which replaceable modules are involved in the system function and what roles they play. See the figure on page 1-24and the table on page 1-25.

Does not boot on	Check power source.	AC adapter	Check AC adapter.
AC or battery	Press and hold power button	SDRAM module.	Remove all but one
	Press and hold power button	SDRAM module.	SDRAM module and
	to turn notebook off, and then		SDRAM module and
	to turn notebook off, and then	CPU module	try again.
	press power button to turn	CPU module	try again.
	press power button to turn		If the power status
	notebook on.	Switchboard PCA	If the power status
	Unplug the AC adapter,	Motherboard	light does not turn
	Unplug the AC adapter,	Motherboard	on, reprogram the
	remove the battery and any PC	Display assembly	BIOS, and replace
	cards, press the reset button		BIOS, and replace
			the top case, replace

	to turn notebook off, and	Hard drive
	to turn notebook off, and	Hard drive	the motherboard.
	reconnect power and try again.		If power status light
	Do not use touch pad while		If power status light
	Do not use touch pad while		turns on but display
	booting		turns on but display
	booting		remains off, try
	or resuming.		remains off, try
	or resuming.		external monitor. If
	Remove all but one SDRAM		monitor shows
	module and try again. Reinsert		successful boot,
	any other SDRAM module and		replace display
	try again.		assembly. If monitor
			shows activity but
			BIOS does not
			complete, replace
			display assembly.
			If monitor is blank,
			replace switchboard
			PCA, replace
			motherboard.
			If power status light
			and display turn on,
			BIOS completes, but
			OS does not start
			from hard disk or
			floppy drive, replace
			CPU module, replace
			motherboard. If OS
			starts from floppy
			drive, reload hard
			drive, replace hard
			drive.
Beeps once, spins	Make sure at least one	SDRAM module
hard disk, repeats,	SDRAM module is installed.
but does not boot

3-8

Troubleshooting and Diagnostics

Service Manual

2547EA, 2550CA, 2552AI, 2541AH, 2543AH specifications

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