HP Workstatio D3J88UT#ABA, Z220 F1J90UAABA manual Remove the graphics card last. Replace the faulty

Table 4-1Minor problems (continued)

Problem	Cause	Possible Solution
Workstation powered off	Processor thermal protection is	1.	Verify that the computer air vents are not blocked.
automatically and the Power	activated.	2.	Open the access panel and press the computer power
LED flashes red 2 times (once
	A fan might be blocked or not		button.
every second), followed by a
	turning.
2-second pause, and then two		3.	Verify that the system fan is running.
simultaneous beeps sounded.
	OR	4.	Verify that the processor heatsink fan spins. If the fan is
	The processor heatsink is not		not spinning, verify that the heatsink fan cable is
	properly attached to		plugged into the system board connector and that the
	the processor.		heatsink is properly seated.
		5.	Replace the processor heatsink.
System does not power on,	System cannot power on.	Press and hold the power button for less than four seconds.
and the LEDs on the front of		If the hard drive LED turns green:
the computer are not flashing.		1.	To find a faulty device, remove all devices one at a
			time:
			a. Disconnect AC power to the computer.
			b.	Remove a device.
			c.	Reconnect AC power and power on the
				computer.
		2.	Repeat this process until the faulty device is identified.
			Remove the graphics card last. Replace the faulty
			device.
		3.	If no faulty device is found, replace the system board.
		OR
		1.	Press and hold the power button for less than four
			seconds. If the hard drive LED does not illuminate:
			a.	Verify that the computer is plugged into a
				working AC outlet.
			b.	Verify that the power button harness is connected
				to the inline front panel I/O device assembly
				connector.
		2.	Verify that the power supply unit (PSU) cables are
			connected to the system board.
		3.	Verify power supply unit PSU functionality:
			a. Disconnect the AC power.
			b.	HP Z820 Workstation only—Remove PSU. All
				other workstations, unplug cables connected to
				the system board.
			c.	Reconnect AC power
				● If the PSU fan spins and the BIST LED
				illuminates, the PSU is good; replace the
				system board.

● If the PSU fan does not spin or the LED does not illuminate, replace the PSU.

126 Chapter 4 Diagnostics and troubleshooting