HP dc7608 manual Desktop Management Guide on

POST Error Messages

POST Diagnostic Front Panel LEDs and Audible Codes (Continued)

Activity	Beeps	Possible Cause	Recommended Action
Red Power LED	4	Power failure	Open the hood and ensure the power
flashes four times,		(power supply is	supply cable is seated into the connector
once every		overloaded).	on the system board.
second, followed			Check if a device is causing the problem
by a two second			by removing ALL attached devices (such as
pause.			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.
			Replace the power supply.
			Replace the system board.
Red Power LED	5	Pre-video memory	Reseat DIMMs. Power on the system.
flashes five times,		error.	Replace DIMMs one at a time to isolate
once every			the faulty module.
second, followed			Replace third-party memory with HP
by a two second
			memory.
pause.
			Replace the system board.
Red Power LED	6	Pre-video	For systems with a graphics card:
flashes six times,		graphics error.	Reseat the graphics card. Power on the
once every			system.
second, followed			Replace the graphics card.
by a two second
			Replace the system board.
pause.
			For systems with integrated graphics,
			replace the system board.
Red Power LED	7	System board	Replace the system board.
flashes seven		failure (ROM
times, once every		detected failure
second, followed		prior to video).
by a two second
pause.
Red Power LED	8	Invalid ROM	Reflash the ROM with the latest BIOS
flashes eight times,		based on bad	image. See the “ROM Flash” section of the
once every		checksum.	Desktop Management Guide on the
second, followed			Documentation and Diagnostics CD.
by a two second			Replace the system board.
pause.

C–10 390742-002 Service Reference Guide, dc7600