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IMac randomly shuts down

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My IMac randomly shuts down. I have the energy saver set for computer to sleep after 1 hour. I have not installed any new software. This problem began about a month ago. I have to use the restart button and always get an error, that the computer shut down unexpectedly. I copied one of the Panic Reports if that will help resolve the problem. I have checked the "maximum temperature" in Console and get no messages and many messagfor "shutdown".
Istat:(Celsius)Temps
HD:MacIntosh 49
CPU 39
CPU Heatsink 39
Fans:
Optical Drive 798rpm
Hard Drive 1599rpm
CPU Drive 1199 rpm
I also use Airport Extreme Version 7.4.2
Any ideas?
Thanks
Message was edited by: Raydream

Answers

Hi Raydream ,
Try another outlet in another part of the house
Do you use a surge protector? do you have another surge protector to try? Just in case some thing is wrong with the surge protector your using. Also dose any thing else turn off or just the computer.
things you can try:
Make sure your software is up to date:
http://support.apple.com/kb/ht1338
Verify your firmware is up to date:
http://support.apple.com/kb/ht1237
reset the SMC:
http://support.apple.com/kb/ht3964
reset NVRAM:
http://support.apple.com/kb/ht1379
if your still having the issues I would back every thing up and then book an appointment for the closest apple store genius bar.
http://www.apple.com/retail/geniusbar/
if there is no apple store near you i'd locate an authorized repair center:
http://support.apple.com/kb/ht1434 , for the US it's http://www.apple.com/buy/locator/service/
you can also call apple care (1 800 APL CARE)

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