24" iMac displaying small green lines

I'm having a big problem with my iMac 24" when I'm using Aperture or iTunes music videos in full screen mode.
I am getting groups of little green lines about an inch long and a pixel or two deep, stacked in groups of five or six on top of each other like a small wavey flag. These little "flags" are spread all over the display and make for one annoying interuption of either the video I'm watching or the photos I'm editing in Aperture.
Sometimes when I'm scrolling through my shots quickly in Aperture the lines become much larger and then red and blue blocks of lines appear, they disappear again when I give the scrolling a rest for a minute or so.
I'm using 2Gb RAM, the 9600 graphics card and all my software is bang up to date.
Any ideas any one?
John
Cheers
iMac 24'   Mac OS X (10.4.8)   2GB RAM, 256Mb,

Clean erase and reinstall to factory conditions did not help with the graphic corruption/glitches.
Here are the actions I've performed so far:
•Got iMac on Tuesday (three days ago) and proceeded to immediately install all updates, including the EFI 1.1 firmware update
•Installed Aperture, the problem started showing itself sporadically
•As I imported more and more Aperture projects the problem started getting more widespread, it started showing up in Dashboard (problem is equal on both internal and external monitors)
•World of Warcraft started showing the flags/squares/lines in the menus, as well as major geometrical corruption in the 3d views (planes intersecting the world, characters warping, etc.)
•Reset SMC (unplug all cables, wait 15 seconds, plug back in without holding power button)
•Reset PRAM/NVRAM (several times)
•Ran without any software in background
•Ran Memtest (5-pass, single user mode for max available RAM) all tests passed
•Ran Apple Hardware Test three times, once the standard test, twice the extended, none show any errors
•Wipe drive, reinstall from restore discs, no updates installed whatsoever, no additional software installed, and it still exhibits the error inside of PhotoBooth, just as it did before, and just as it did for Janet in the post I link to above. PhotoBooth seems to show the most artifacting when the effects are turned on.
I'm taking it in tonight, we'll see what they say. I will keep this thread updated with my actions and any responses I receive.
One thing I feel I should mention is that I don't think it's Aperture's fault. It's just the main indicator for us since we all use it and it makes heavy use of the GPU.
Also, my problem started out small and got bigger over the 2/3 days I was using the machine, indicative of a developing hardware issue. If it was a software glitch, it would be less likely to behave that way.

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