IMac freezing in both Mac and XP

I am having some very annoying issues with my iMac. (Specs at bottom).
First, while I am in my OS X, at the odd time my screen will go completely black, I will still be able to hear sounds, like Ventrilo (Voice communication program used with gaming), however everything else will seize up. Other times the screen will not go black, however the screen will freeze at it's current state, again still being able to hear sounds. Other times, everything will seize up without being able to hear anything. At all points I have to do a shut off from the back and turn it back on. These problems occur when I'm gaming, or just clicking on even a forum topic.
Second, when I boot into XP, once I load into windows the system freezes up as well. Sometimes it will freeze, the screen will flicker, go black then release alloying me to carry on doing things, then it will freeze up again and I have to reboot. Other times it just freezes up completely, or just goes black.
I had this problem a while back during the summer with XP, then it seemed to sort itself out. Suddenly the past few days it has re-occurred. The problem in Mac OS seems to come and go as well.
When I think about this problem, the first thing that pops into my head is maybe the GFX card is over heating, but that's just a thought. Any advice?
Specs:
Processor: 2 GHz Intel Core Duo
Memory: 2 GB 667 MHz DDR2 SDRAM
Thanks

I have similar issues, and I am running the latest version of Mac OS X,10.6.5, and using Windows 7 32-bit with Boot Camp. For the most part, both disks work well, but since I installed Windows 7, I have constant issues with the ATI display driver freezing and restarting, or the screen just goes black and I have to reboot.
Recently, I have started to have problems on the Mac side- the screen freezes and I can only see the mouse pointer move. I have to then reboot. It happens at least once a day now. Apple tells me to schedule a repair, which I have not done as yet, as I'm wondering if others have had similar issues and am also seeking advice before having to go through a costly repair or replacement. (The specs on my iMac are the same as in the post above). Thank you.
Message was edited by: afuturo

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