Screen Message Probable Cause Recommended Action
946-Correctable patrol data
ECC error
Bad DIMM or improperly installed
DIMM
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.
949-Correctable non-mirrored
demand data ECC error
Bad DIMM or improperly installed
DIMM
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.
950-Redundant retry FBD
northbound CRC error
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.
953-Non-aliased uncorrectable
patrol data ECC error
Double bit ECC error due to bad DIMM
or improperly installed DIMM
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.
956-Non-aliased uncorrectable
non-mirrored demand data
ECC error
Bad DIMM or improperly installed
DIMM
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.
960–CPU Overtemp occurred. The ambient temperature could
exceed operating limits (maximum =
95° F), or there are obstructions to
airflow, including dust build up.
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.
Table 5-18 POST error messages (continued)
132 Chapter 5 System diagnostics and troubleshooting ENWW
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