I assume you don't keep your iMac in a location that gets that hot, so does your iMac actually shut itself off when it is warmed up?
The power supply on your iMac is known to be a little fragile. so you should try simply replacing the power supply. Apple may do this at no charge.
http://www.apple.com/support/imac/re...ensionprogram/
Even if you pay for the repair, the power supply is not too expensive, and is a 5-minute job to replace.
You should also check the air intake area all along the bottom edge of your iMac. Make sure that area is not plugged with debris. I see some of those models that are completely coated with lint and dust. A little vacuum brush under that area sometimes makes a big difference.




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