HP Pro 6305 C1E21UT#ABA, E3S36UT#ABA, E3S33UT#ABA Activity Beeps Possible Cause Recommended Action

Table 9-2Diagnostic Front Panel LEDs and Audible Codes (continued)

Activity	Beeps	Possible Cause	Recommended Action
Red Power LED flashes two	2	Processor thermal	1.	Ensure that the computer air vents are not
times, once every second,		protection activated:		blocked and the processor cooling fan is
followed by a two second		A fan may be blocked or		running.
pause. Beeps stop after fifth			2.
iteration but LEDs continue		not turning.		Open hood, press power button, and see if
until problem is solved.		OR		the processor fan spins. If the processor fan
				is not spinning, make sure the fan's cable is
		The heat sink/fan		plugged onto the system board header.
		assembly is not properly	3.	If fan is plugged in, but is not spinning, then
		attached to the processor.		replace heat sink/fan assembly.
			4.	Contact an authorized reseller or service
				provider.
Red Power LED flashes three	3	Processor not installed	1.	Check to see that the processor is present.
times, once every second,		(not an indicator of bad	2.	Reseat the processor.
followed by a two second		processor).
pause. Beeps stop after fifth
iteration but LEDs continue
until problem is solved.
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 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.

Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 183