Since I upgraded to OS 10.6.8 from 10.5.x my 2x3GHz quad-core Intel Xeon desktop spontaneously turns off as if I pulled the plug. Mostly it happens when there is no open software and it's in the sleep mode, but it has happened while I'm working.

Since I upgraded to OS 10.6.8 from 10.5.x my 2x3GHz quad-core Intel Xeon desktop spontaneously turns off as if I pulled the plug. Mostly it happens when there is no open software and it's in the sleep mode (because it spends more time like that), but it has happened while I'm working. It just suddenly quits.

This is a suspicious sign of power supply failure. I would have that checked into. Others who have had similar problems have had the power supplies replaced which fixed the issue.

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