HP 7300 manual Activity Beeps Possible Cause Recommended Action

Table E-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
times, once every second,		supply is overloaded).
followed by a two second		OR
pause. Beeps stop after fifth
iteration but LEDs continue		The incorrect external
until problem is solved.
		power supply adapter is

being used on the USDT.

1.Open the hood and ensure the 4 or 6-wire power supply cable is seated into the connector on the system board.

2.Check if a device is causing the problem by 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.

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.

208 Appendix E POST Error Messages