Anything plugged into the iMac like a external hard drive this can cause issues.

From: [email protected] 
[mailto:[email protected]] On Behalf Of tom holloman
Sent: Wednesday, April 27, 2011 2:29 PM
To: [email protected]
Subject: [MacGroup] off and on

Aloha:
After updating to 10.6.7 my imac randomly shuts itself off and then turns back 
on.  Sometimes as often as every 20 min.  Other times will stay on for 15-20 
hours.  Any ideas are appreciated.
Tom
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