OK, I maybe a little late with this but my Xserver G4 1.33 began shutting itself down a sporadically a couple of weeks ago.
One message that consistently showed up in the logs was:
localhost kernal[0]:ApplePMU:: PMU forced shutdown, cause = -xxx
where xxx was either 93, 122, or 127
I researched this error message on internet and came up with all sorts of problems and solutions such as Retrospect, bad drivers, SCSI cards, reset PMU, check logic board PRAM battery, bad RAM, etc.
I followed all of the suggestions:
1) disconnected all peripherals
2) disconnected SCSI devices
3) ran diagnostics in FireWire peripherial drives
4) reset the UPS
5) zapped the PRAM
6) reset the PMU
7) ran TechTool, DiskWarrior, Apple Hardware Diagnostics
8) replaced the PRAM battery
9) tested the RAM with Memtest for 8 hours (all the time I could afford)
Nothing. The server would still shut itself down randomly.
[b]In the end, I replaced the power supply. BINGO[/b]. javascript:emoticon(‘;)’)
As of the time of this message, the Xserver has been running for over 72 hours with no problems.
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