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Table 4-10 POST error messages (continued)
Screen message Probable cause Recommended action
922—Front USB 2 Not
Connected
Front 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.
927—Fatal error on DIMM in
slot CPU X DIMM Y
Fatal 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 identified slot.
928—Fatal error occurred in
the designated slot.
Fatal error occurred in the designated
slot.
Move the card to a different slot. If the problem
persists, replace the card.
939—Front USB 3.0 Not
Connected
Front USB 3.0 mechanism is missing
or is not connected.
1. Replace or reconnect the missing Front USB 3.0
mechanism to the system board.
2. Reseat or replace the missing mechanism cable.
940—Front 1394 Not
Connected
Front 1394 mechanism is missing or is
not connected.
1. Replace or reconnect the missing Front 1394
mechanism to the system board.
2. Reseat or replace the missing mechanism cable.
941—PCIe Device(s) installed
in slots 3 or 4 with a single
CPU
Invalid system configuration. 1. Move the PCIe device from PCIe slots 3 and/or 4
to other PCIe slots.
2. Add a second processor using appropriate HP
accessory kit.
1801—Microcode Update
Error
Unknown or unsupported processor
stepping.
The microcode update failed. If the processor stepping
is supported, contact HP Support.
1802—Processor Not
Supported
The system board does not support the
processor.
Replace the processor with a compatible one.
Diagnostic codes and errors
157