IMac suddenly shut off.

I was using my iMac earlier today when it suddenly shut off. The only programs I had opened were Safari and iTunes. I put my hands on top of the computer and noticed that it felt especially hot. Could the cause of my iMac shutting off be because it got too hot? Should I be concerned about possible damages that may have occurred? I appreciate your help.
One more thing; my iMac won't go to sleep according to the inactive time that I have specified in the Energy Saver settings. It only goes to sleep when I access the sleep command or push the power button. Otherwise it just stays on. Thanks again.

Thanks for all your replies, guys. I hadn't logged in since Monday so I didn't know that there had been more posts since then. Anyways, to address why there hasn't been a recall or any public recognition of the problem (that I know of), I have a theory: after all the Apple commercials that basically boil down to "Macs are better than PCs because Macs work," how bad would it look that they would have to do a major recall on these new iMacs?
This is actually my first Mac. I was really stoked about it because everyone that I spoke to that had owned Macs never had any complaints. I'm getting a little concerned now. We've spent good money on these machines and apparently for a lot of us they are turning out to be a major headache. If I wanted a computer that performed poorly I would have bought a PC and spent half the money (sorry to all the PC guys out there. I've had some bad experiences with PCs that helped fuel my decision to purchase a Mac).
Anyways, I've had another unexpected shutdown earlier today so I'm going to call Apple again and see what they say. For any of you who are having this problem and are going to call Apple for the first time, your support may go something like this: turn the computer off and turn it on again holding the Command, Option, P and R buttons simultaneously. Then, using the Disk Utility, you will verify the disk. Mine claimed that everything "seemed" to be okay and as of Monday I was to monitor my system and call back if it happened again. I'm going to call them again and I'll let you all know what they say.
Dennis, thanks for the link. I have not read it yet, but I will. I'll keep you all updated. Thanks again and good luck to all of you as you try to get your Mac issues resolved.

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