iMac shuts down by itself, won't restart

Recently, my iMac has taken to suddenly shutting down by itself without warning. If I then press the power button, nothing happens. After leaving it to 'cool down' for a while, it will then restart in the usual way, only to shut down again after 30 mins or so.

Any ideas what's wrong ?

I have already tried doing a SMC and PRAM reset, and repairing disk permissions, with no luck.

Chris.

Message was edited by: CNS

20" iMac Core Duo, Mac OS X (10.5.7)

Posted on Jun 8, 2009 8:02 AM

16 replies

Nov 10, 2009 2:38 PM in response to nivlacskrats

Here we are, over 24 hours since I replaced the logic board, SMC controlling the fans, Boinc running 100% of the processor 100% of the time. My issue seems to be fixed.

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iMac shuts down by itself, won't restart

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