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Jun 19, 2011 7:29 PM in response to mdcollinsby WZZZ,5 is a shutdown from the menu. Not completely certain, and can't find exactly what it means, but I think the 0 is normal as well. Apple doesn't publish what these codes mean.
Could be overheating or a power supply issue. For the overheating, get iStat Pro and post the temps when you've been running a while. Also, post the fan rpms.
Do the shutdowns happen when you are doing anything in particular? Something CPU or graphics intensive like gaming?
You might try running the Hardware Test in Extended.
http://support.apple.com/kb/ht1509
Message was edited by: WZZZ
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Sep 7, 2011 11:34 AM in response to mdcollinsby Hank Schultz,On the iMac7,1, a shutdown cause of "0" means either that power was disconnected, or you last booted from a different device. "5" is a normal shutdown.
These are both normal shutdown codes. You can create a 0 by pulling the power cord, and you can create a 5 by shutting down normally.