HP Pro 4300 C9H69UT#ABA, D8C84UT#ABA manual Activity Blinks Possible Cause Recommended Action

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

Activity	Blinks	Possible Cause	Recommended Action
Red Power LED flashes	4	Power failure (power supply	1.	Open the hood and ensure the 4 or 6-wire power
four times, once every		is overloaded).		supply cable is seated into the connector on the
second, followed by a two		OR		system board.
second pause. Beeps stop			2.	Check if a device is causing the problem by
after fifth iteration but		The incorrect external power
LEDs continue until				removing ALL attached devices (such as hard,
problem is solved.		supply adapter is being used		diskette, or optical drives, and expansion cards).
		on the USDT.		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.
			OR
			The USDT power supply adapter must be at 135W
			and use the Smart ID technology before the system
			will power up. Replace the power supply adapter with
			the HP-supplied USDT power supply adapter.
Red Power LED flashes	5	Pre-video memory error.	CAUTION: To avoid damage to the DIMMs or the
five times, once every			system board, you must unplug the computer power
second, followed by a two			cord before attempting to reseat, install, or remove a
second pause. Beeps stop			DIMM module.
after fifth iteration but			1.	Reseat DIMMs.
LEDs continue 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	6	Pre-video graphics error.	For systems with a graphics card:
six times, once every			1.	Reseat the graphics card.
second, followed by a two
second pause. Beeps stop			2.	Replace the graphics card.
after fifth iteration but
LEDs continue until			3.	Replace the system board.
problem is solved.

For systems with integrated graphics, replace the system board.

Red Power LED flashes	8	Invalid ROM based on bad
eight times, once every		checksum.

second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved.

1.Reflash the system ROM with the latest BIOS image.

2.Replace the system board.

Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 95