Visual Glitches On iMac

Yesterday I was working with my iMac (24-inch iMac 2008 with a Nvidia 8800GS), and it suddenly froze, and the screen was covered in dark blue spots, with various visual glitches such as black bars appearing on the screen and flickering. I could still move the mouse and iTunes continued to play, but it would regularly lock up, and I was unable to interact with any of the open apps or the Finder.
I performed a hard shut down and re-booted and the same thing happened within minutes, so I shut down and cleaned the PRAM & NVRAM. Upon re-booting (and after the Apple symbol dissapeared) I was presented with a light grey screen with some artifacts which used to form my desktop, and the bottom half of the screen constantly flickered.
Okay, I resign myself to the fact that I've probably got a cooked GPU, and go to bed. This morning I try the Mac again, to the same result, but afterwards I boot up into my Windows XP partition, and it works... perfectly. So I decide to run it through its paces a bit, and run a game, and it works fine, no graphical problems or issues. In fact the only graphics problem of any note is when I change the volume, and the osx volume controls flickers in and out of view.
So now I'm confused. Surely if the GPU was cooked, it couldn't run a 3D game (I used Psi-Ops to test), yet clearly something's wrong.
The only hardware modification I've done to the Mac, was to swap out the stock 2 x 1gb ram modules for 2 x 2gb ram, but that was two months ago now, and it's all been running without issue so far.
So any ideas as to what the problem could be, and is there anything more I can do to try and fix it myself before bringig it in for repair?
Thanks in advance for any help offerred.

Exact setup as except 4 each 1tb black WD drives and two 2.26 cpu's( early 2009) and no problems at all. I have explanation fore you problems. Just get Apple to replace your machine again...
Willp.

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Attachments:
LabVIEWGlitch.jpg ‏179 KB

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