Intel iMac shutting off suddenly, not coming back for hours

Hello,
Last night my iMac suddenly shut off; I tried for about twenty minutes to turn it back on (I tried the power button, unplugging and replugging, changing outlets...), then gave up. This morning I tried it and it worked just fine, but after several hours it shut off again. That was about three hours ago and it hasn't come back yet. Curiously it shut off right before iSight was going to snap a picture in Photo Booth, and I just can't remember if that's when it happened last night too...
Any help?

Sounds like an overheating problem. You could try to reset the SMC and see if that helps, if not it probably needs to go to the shop.
Here is a link to how to reset the SMC on a new Mac
http://docs.info.apple.com/article.html?artnum=303446

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Message was edited by: Jonathan Glover

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Your iMac is warranteed for the first year so you are covered. Applecare extends that to three years but in your case you didn't need to buy it to cover this issue. Call apple and make an appointment to bring it in.
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Intel iMac shutting off suddenly, not coming back for hours

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