HP 100B manual Activity Beeps Possible Cause Recommended Action

Table A-2Diagnostic Front Panel LEDs and Audible Codes (continued)

Activity	Beeps	Possible Cause	Recommended Action
Red Power LED flashes four	4	Power failure (power	1.	Open the hood and ensure the 4 or 6-wire
times, once every second,		supply is overloaded).		power supply cable is seated into the
followed by a two second				connector on the system board.
pause. Beeps stop after fifth			2.	Check if a device is causing the problem by
iteration but LEDs continue
until problem is solved.				removing ALL attached devices (such as
				hard, diskette, or optical drives, and
				expansion cards). Power on the system. If
				the system enters the POST, then power off
				and replace one device at a time and
				repeat this procedure until failure occurs.
				Replace the device that is causing the
				failure. Continue adding devices one at a
				time to ensure all devices are functioning
				properly.
			3.	Replace the power supply.
			4.	Replace the system board.
Red Power LED flashes five	5	Pre-video memory error.	CAUTION: To avoid damage to the DIMMs or
times, once every second,			the system board, you must unplug the computer
followed by a two second			power cord before attempting to reseat, install, or
pause. Beeps stop after fifth			remove a DIMM module.
iteration but LEDs continue			1.	Reseat DIMMs.
until problem is solved.
			2.	Replace DIMMs one at a time to isolate the
				faulty module.
			3.	Replace third-party memory with HP
				memory.
			4.	Replace the system board.
Red Power LED flashes six	6	Pre-video graphics error.	For systems with a graphics card:
times, once every second,			1.	Reseat the graphics card.
followed by a two second
pause. Beeps stop after fifth			2.	Replace the graphics card.
iteration but LEDs continue
until problem is solved.			3.	Replace the system board.
			For systems with integrated graphics, replace
			the system board.
Red Power LED flashes	7	System board failure	Replace the system board.
seven times, once every		(ROM detected failure
second, followed by a two		prior to video).
second pause. Beeps stop
after fifth iteration but LEDs
continue until problem is
solved.
Red Power LED flashes eight	8	Invalid ROM based on	1.	Reflash the system ROM with the latest
times, once every second,		bad checksum.		BIOS image.
followed by a two second			2.	Replace the system board.
pause. Beeps stop after fifth

iteration but LEDs continue until problem is solved.

Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 83