I posted something about this as a comment on the last story, but it seems worth mentioning here as well, as I am hearing from others with this same issue. To recap: I was having problems with my 2 GHz G5 iMac where it was inexplicably shutting down at random intervals (and one time starting up inexplicably). The issue was resolved when I (1) ran Virex which removed two "possibly infected" files and (2) I removed the USB cable from the Uninterruptable Power Supply (UPS) that had been hooked up to the iMac. Well, it turns out that the UPS was the problem.
For those who are not aware, MacOS X has a built in ability to communicate with most modern UPS systems, so that if the UPS is tripped (i.e. power is lost) the iMac can use the extra time provided to shut down gracefully. The connection is via USB cable.
It turns out that iMacs often have problems with UPS systems. A small problem with the UPS circuitry can trip complete failures in the iMac. In this case, the UPS itself was working fine as a battery - 100% charge and it did not kick on during the failures. But the circuitry SIGNALLING a failure appears to have problems. Simply removing the USB cable and deactivating the UPS software fixed the issue.
Sigh. And I thought I was being responsible making sure my iMac was on an Uniterruptable Power Supply - protecting my investment. Instead, I may have inadvertantly caused some damage.
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