IMac 20" shutting down randomly

Hey folks,
My iMac has been shutting down randomly a couple of times a day. It's been happening ever since I purchased the machine (April, 2008) and more often when its warmer (I live in Los Angeles). I've taken the computer in for a check up and the Genius Bar said that they couldn't replicate the problem. They had the computer over over a week.
Now that it's getting warmer these days, I'm finding my iMac shutting down more often. Does anyone else have this problem? Any luck with the Genius Bar?
I've seen my hard drive reach 65ºC and the rest of the components in the high 50's, low 60's. As a temporary solution, I'm running smc fan control to try to keep things cool.
Thanks!

Hi, a couple of questions -> Applecare? Have you contacted Apple Customer Relations?
I would also document everything you do from when you Start Up, times etc., Apps etc.
If you have a digital camera with movie, load it up with a large memory card & set it on a table near your computer & run it until you capture the shut down..After that Apple will take action...
Recently my 2 laptops MBPro 14mths old/MB 7 months old - Both had issues, after a few tests via AppleHelp still no joy - Apple replaced both with the latest models...
If the Genius can't help - Ask for the Manager...
Apple Corporate-408-996-1010.....L

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