HP Z 440 Owners Manual

							ActivityPossible causeRecommended action2.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 computer. If the system enters  the POST, power 
o

						

							ActivityPossible causeRecommended actionPress and hold the power button for less than four seconds. If the hard drive LED turns white, then:
1.Remove the expansion cards one at a time and try holding the 
power button again for less than four seconds.
2.The problem might be on the system board. Contact HP for  assistance.
Press and hold the power button for less than four seconds. If the hard drive LED does not turn on white then:
1.Check that unit is plugged into a working AC outlet.
2.Open the access panel and check that the power button harness is properly connected to the system board.
3.Check that all power supply cables are properly connected to the 
system board.
4.Check the power supply functionality.
a.Disconnect the AC power.
b.HP Z840 Workstation only—Remove the power supply 
from the chassis. All other workstations, unplug cables  connected to system board.
c.Plug in AC power.

|If the power supply fan spins and the BIST LED illuminates, the power supply is good; replace the system board.

|If the power supply fan does not spin or the LED does  not illuminate, replace the power supply.
*The BIOS option you select controls the blue LED function during these suspend modes.
LED color de

						

							Screen messageProbable causeRecommended action214—DIMM Con

						

							Screen messageProbable causeRecommended action518—PCI fan not detectedPCI fan missing, disconnected, or 
defective.1.Reseat the fan cable.
2.Reseat the fan.
3.Replace the fan.
519—Hard drive fan not 
detectedHard drive fan missing, disconnected, or 
defective.1.Reseat the fan cable.
2.Reseat the fan.
3.Replace the fan.
520—Memory fan (2) not 
detectedMemory fan (2) missing, disconnected, 
or defective.1.Reseat the fan cable.
2.Reseat the fan.
3.Replace the fan.
521—Memory fan (3) not 
detectedMemory fan(3) missing, disconnected, or 
defective.1.Reseat the fan cable.
2.Reseat the fan.
3.Replace the fan.
522—Memory fan (4) not 
detectedMemory fan(4) missing, disconnected, or 
defective.1.Reseat the fan cable.
2.Reseat the fan.
3.Replace the fan.
523—CPU fan (2) not detectedProcessor fan(2) missing, disconnected, 
or defective.1.Reseat the fan cable.
2.Reseat the fan.
3.Replace the fan.
524—Rear chassis fan(2) not 
detectedRear chassis fan(2) missing, 
disconnected, or defective.1.Reseat the fan cable.
2.Reseat the fan.
3.Replace the fan.
525—Front chassis fan(2) not 
detectedFront chassis fan(2) missing, 
disconnected, or defective.1.Reseat the fan cable.
2.Reseat the fan.
3.Replace the fan.
526—CPU Liquid Cooling pump 
not detectedLiquid cooling pump on CPU1 is not 
detected.1.Reseat the pump cable.
2.Replace the pump.
527—CPU Liquid Cooling pump 
(2) not detectedLiquid cooling pump on CPU2 is not 
detected.1.Reseat the pump cable.
2.Replace the pump.
529—Unsupported WiFi 
Device(s) DetectedAn unsupported WiFi device has been 
installed into an internal slot.Remove the unsupported device.917—Front Audio Not 
ConnectedFront Audio mechanism is missing or is 
not connected.1.Replace or reconnect the missing front audio 
mechanism to the system board.
2.Reseat or replace the missing mechanism cable.
918—Front USB Not ConnectedFront USB mechanism is missing or is not  connected.1.Replace or reconnect the missing Front USB 
mechanism to the system board.
2.Reseat or replace the missing mechanism cable.
921—Front USB Not ConnectedFront USB mechanism is missing or is not  connected.1.Replace or reconnect the missing Front USB 
mechanism to the system board.Diagnostic codes and errors95 
						

							Screen messageProbable causeRecommended action2.Reseat or replace the missing mechanism cable.922—Front USB 2 Not 
ConnectedFront USB 2 mechanism is missing or is 
not connected.1.Replace or reconnect the missing Front USB 2 
mechanism to the system board.
2.Reseat or replace the missing mechanism cable.
923—Fatal IRPP error. Potential system problem; contact HP Support.924—Fatal IIO error Potential system problem; contact HP Support.925—Fatal Misc. ErrorA fatal miscellaneous chipset error is 
setected.927—Fatal error on DIMM in slot 
CPU X DIMM YFatal multibit ECC error detected on the 
DIMM in the slot labeled DIMM Y (where Y 
is a number), as labeled on the system 
board.Replace the DIMM in the identi

						

							5Using HP PC Hardware Diagnostics (UEFI)
HP PC Hardware Diagnostics is a 8ni

						

							3.Enter the product name or number.
– or –
Select Identify now to let HP automatically detect your product.
4.Select your computer, and then select your operating system.
5.In the Diagnostic section,  follow the on-screen instructions to select and download the UEFI version 
you want.
Additional BIOS crisis recovery tool
HP provides a BIOS crisis recovery tool through the HP PC Hardware Diagnostics 3-in-1 USB key. This tool can 
be used by HP authorized service providers to recover systems that have failed due to a corrupted BIOS. For 
more information about using the 3-in-1 USB key for BIOS crisis recovery, go to 
http://www.hp.com/go/
techcenter/pcdiags. Additional information is included in the web-based training o

						

							6&on

						

							Resetting the password jumper 
Use the following procedure to disable the power-on or setup password features and clear the power-on and 
setup passwords.
WARNING!To reduce the risk of personal injury from electrical shock and hot surfaces, be sure to 
disconnect the power cord from the wall outlet and allow the internal system components to cool before 
touching.CAUTION:When the computer is plugged in, the power supply has voltage applied to the system board, 
even when the computer is turned 
o