Help! 24" iMac screen turns solid colors, freezes

Hello everyone,
I have a 3.06 GHz, 4 GB, iMac running 10.6.1. and I have a weird problem: while I was running Windows 7 under Boot Camp, during a simple task, my screen suddenly turned a solid shade of gray. Having no other option, I held the power button, turned off the computer, and turned it back on.
When I booted back to OS X, it happened again immediately upon opening iTunes. This time the color was solid black. Concerned, I turned off the computer, waited a moment and booted it back up in Safe Mode, where I currently have no problems whatsoever. From Safe Mode I repaired my disk permissions, cleared my caches, and zapped the PRAM while restarting my computer back into normal mode. Unfortunately the problem persists, this time my screen turning a solid shade of dark purple.
I'm going to call Apple Care in the morning, but has anyone heard of an issue like this? I searched the forums for a solution, but wasn't sure what terms to search for. If anyone has any advice or questions, please let me know!
(Archive and installed Snow Leopard a while back, when it was fairly new, haven't had any problems like this before. Computer seems to run perfectly fine in Safe Mode, vs normal when it immediately becomes unusable upon undergoing a task. Windows 7 no longer able to get to the desktop.)

I, too, have a iMac 24" 3.06GHz and am having the same problem.
I did all the standard torubleshooting tasks, zapping PRAM, repair disc, resetting SMC... etc. and I even went as far as reformatting my hard drive and reinstall Snow Leopard just so I can eliminate the possibility of it being a software issue.
I then ran all the hardware tests I could think of including TechTool Pro and Apple's own Hardware Test from the discs that came with the iMac and also a tool I found online called Memtest+. Nothing, no errors, none.
Finally, I lugged this heavy beast to the local Apple Store and after convincing the "Genuis" that I am no idiot and I did everything I could on my end, they decided that it may be either the logicboard, or more likely the graphics card, or maybe even both. They took it for a few days to run some hardware tests that are apparently not available to the consumers. At this point I was actually HOPING they would find something wrong with it. Five days later, the Apple Store called me and told me the "good news", which is that the only thing they could find wrong with the iMac was a fan needed to be replaced. I trusted the Apple "Genuises" and thanked them when I picked up my iMac. However, when I went home that night, the iMac started freezing again. I called the Apple Store and told them the problem and this time they might as well have just called me a crazy liar. They took it in anyway and told me they would run more of these "special tests". Three days later they called and told me nothing was wrong with my iMac. Not sure what my point is.
Just as a side note, I left my iMac on all night playing videos, something that would heat up the machine, but it was fine, no freezes. But if I play games on it for more than an hour and it would freeze.

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