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2009 Mac Pro 8-core shut off randomly, won't restart. Swapped processor board and HDD's into my other tower. Started fine and worked for about 10 minutes, then same thing. Powered off by itself and won't restart.

247 Views 3 Replies Latest reply: Feb 8, 2013 5:44 AM by The hatter RSS
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Feb 7, 2013 3:29 PM

Both towers are 2009 models, one is 8-core, the other 4. I figured the problem was with the power supply, so I just stuck the guts from the 8-core into the 4-core. It booted up with no issues at all, didn't require any updates or anything. Firefox even restored my tabs. But after about 5-10 minutes, the machine shut off at random and won't start back up. The DIAG LED lights up one LED yellow when pressed, labelled "5V STBY". Same LED on both boards.


Any ideas? I've got two really expensive paper weights at the moment, and my AppleCare plan expired 3 months ago.

Mac Pro, Mac OS X (10.4.11)


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