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### (Fixed in SW 1.1) System Hangs When a DIMM UE Occurs on CPU0 (6891319)

If an uncorrectable error (UE) takes place in a DIMM on CPU module slot 0 during POST, the system might hang and not provide any video output. The system can recover during POST from UEs that are not in CPU module slot 0.

Check the SEL logs on the service processor. If the SEL log shows the following and no further output, then it is likely you are encountering this issue.

    5 | 11/18/2009 | 05:32:48 | System Boot Initiated #0x01 | Initiated by power up | Asserted
    6 | 11/18/2009 | 05:32:53 | Processor | Presence detected | Asserted | OEM Data-2 0x08 OEM Data-3 0x08
    7 | 11/18/2009 | 05:32:53 | System ACPI Power State #0x0f | S0/G0: working | Asserted

## Workaround

1. Call Sun service for help with identifying the faulty DIMM.
2. Remove the faulty DIMM from CPU module slot 0.

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