HP Xw8400 - Workstation - 4 GB RAM Technical Reference Manual page 142

Table 5-18 POST error messages (continued)
Screen Message
946-Correctable patrol data
ECC error
949-Correctable non-mirrored
demand data ECC error
950-Redundant retry FBD
northbound CRC error
953-Non-aliased uncorrectable
patrol data ECC error
956-Non-aliased uncorrectable
non-mirrored demand data
ECC error
960–CPU Overtemp occurred.
132 Chapter 5 System diagnostics and troubleshooting
Probable Cause
Bad DIMM or improperly installed
DIMM
Bad DIMM or improperly installed
DIMM
Double bit ECC error due to bad DIMM
or improperly installed DIMM
Bad DIMM or improperly installed
DIMM
The ambient temperature could
exceed operating limits (maximum =
95° F), or there are obstructions to
airflow, including dust build up.
Recommended Action
CAUTION: Disconnect AC power from the
workstation before reseating or replacing components
because there is power to the system board even when
the workstation is powered down.
Try reseating the DIMMs and make sure that they are
inserted correctly. If the problem persists, remove or
replace the DIMMs one by one until the problem DIMM
is isolated.
CAUTION: Disconnect AC power from the
workstation before reseating or replacing components
because there is power to the system board even when
the workstation is powered down.
Try reseating the DIMMs and make sure that they are
inserted correctly. If the problem persists, remove or
replace the DIMMs one by one until the problem DIMM
is isolated.
CAUTION: Disconnect AC power from the
workstation before reseating or replacing components
because there is power to the system board even when
the workstation is powered down.
Try replacing or reseating DIMMs first, then system
board.
CAUTION: Disconnect AC power from the
workstation before reseating or replacing components
because there is power to the system board even when
the workstation is powered down.
Try reseating the DIMMs and make sure that they are
inserted correctly. If the problem persists, remove or
replace the DIMMs one by one until the problem DIMM
is isolated.
CAUTION: Disconnect AC power from the
workstation before reseating or replacing components
because there is power to the system board even when
the workstation is powered down.
Try reseating the DIMMs and make sure that they are
inserted correctly. If the problem persists, remove or
replace the DIMMs one by one until the issue is
resolved.
1. Be sure you are not operating the system in an
environment that exceeds 95° F.
2. Disconnect power and open the access panel.
3. Check that cables are not blocking CPU heatsink
fans or front fan, if installed.
4. Check that there is not excessive dust on major
components.
5. If airflow is acceptable and there is not excessive
dust, the thermal sensing circuitry has failed on the
processors or on the system board. You must
replace the processors, the system board, or both.
ENWW