Desktop visual artifacts

I was wondering if anybody has seen the following.
I just purchased a new intel based mac mini and am having problems with the desktop. Occasionally when returning from frontrow or the screen saver application, the desktop gets corrupted. The corruption manifests itself as both a horizontal bar of noise about 100 pixels tall spanning the entire width of the desktop and a noise border around any open application window of roughly the same width.
Any suggestions on what I should do? Started talking to applecare but they want me to reinstall OSX and/or exchange for new hardware. I have a sneaking suspicion that won't resolve my problems.
I have a screen capture if anyone is REALLY interested.
Mac Mini (Intel) Mac OS X (10.4.6)

After searching a little harder, I found what I was looking for. It appears that it is either a driver issue or heat issue with the shared memory graphics cards. Rumor has it is fixed with OSX 10.4.7. It sounds like it affects MacBooks and the Mac Mini. Returning the Mac Mini for a new one, reinstalling from scratch, disabling secure virtual memory, etc have not fixed the issue. We are waiting on apple for this one.
Here are some other threads that discuss this issue:
http://discussions.apple.com/thread.jspa?threadID=489831
http://discussions.apple.com/thread.jspa?threadID=394694
Mac Mini (Intel) Mac OS X (10.4.6)

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bangkok_manouel wrote:revert patch of guilty commit: https://gist.github.com/anonymous/5180682
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http://i.imgur.com/VpMCEsI.png
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Desktop visual artifacts

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