Strange green lines with ATI 4850 iMac in Aperture, then crash.

Well, I have been running my iMac, 3GHZ, ATI 4850 for about a week now. I have had 2 lockups in OSX, 1 in boot camp and 1 graphics crash.
In OSX, all the crashes/lock-ups happen after I get these strange green lines, artifacts, that run across part of my screen. They change in length but generally always run horizontal. I can seem to find a way to post pictures here, but I have a couple screen grabs here:
http://atothe420k.blogspot.com/
Since I have to power off in the middle of Aperture, I am also getting corrupt databases, which take forever to rebuild.

Well, I called into Apple Care, after my machine crashed again twice today, once in a web browser and once under EveOnline. The person said to download and use some fan control software. It installed, but didn't do much, couldn't get it to change fan speed or anything else.
I installed iStatPro, which is great, and kept checking the temp of the ATI card, it would crash when the temp was up around 65-70 degrees C. Not sure if that is high or not.

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