HP Z420 D3J34UT#ABA, Z220 F1J90UAABA manual Add a second processor using appropriate HP

Table 4-10POST error messages (continued)

Screen message	Probable cause	Recommended action
922—Front USB 2 Not	Front USB 2 mechanism is missing or	1.	Replace or reconnect the missing Front USB 2
Connected	is not connected.		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.
927—Fatal error on DIMM in	Fatal multibit ECC error detected on	Replace the DIMM in the identified slot.
slot CPU X DIMM Y	the DIMM in the slot labeled DIMM Y
	(where Y is a number), as labeled on
	the system board.
928—Fatal error occurred in	Fatal error occurred in the designated	Move the card to a different slot. If the problem
the designated slot.	slot.	persists, replace the card.
939—Front USB 3.0 Not	Front USB 3.0 mechanism is missing	1.	Replace or reconnect the missing Front USB 3.0
Connected	or is not connected.		mechanism to the system board.
		2.	Reseat or replace the missing mechanism cable.
940—Front 1394 Not	Front 1394 mechanism is missing or is	1.	Replace or reconnect the missing Front 1394
Connected	not connected.		mechanism to the system board.
		2.	Reseat or replace the missing mechanism cable.
941—PCIe Device(s) installed	Invalid system configuration.	1.	Move the PCIe device from PCIe slots 3 and/or 4
in slots 3 or 4 with a single			to other PCIe slots.
CPU		2.	Add a second processor using appropriate HP
			accessory kit.
1801—Microcode Update	Unknown or unsupported processor	The microcode update failed. If the processor stepping
Error	stepping.	is supported, contact HP Support.
1802—Processor Not	The system board does not support the	Replace the processor with a compatible one.
Supported	processor.

Diagnostic codes and errors 157