Monitor wigging out; lines and weird layers; Software or Hardware?

Monitor wigging out; lines and weird layers jiggle and shake back and forth.
iMac will only run a few minutes before it happens.
I am ran Apple Hardware Test and everything checked out OK and my iMac ran flawlessly for hours after AHT, then I restarted it and BAM!! there it is again only worse.
Could this a software issue?
Any ideas??

same thing here....was fine one min, then i come back after the screen saver came on, and it wouldn't respond. It wasn't responding so I had no option but to force shutdown. Turned it back on and the screen went wacky on me. Now it'll start up, but won't make it to my desktop. I can access it via afp (file sharing) but not VNC (screen sharing). Somebody help please! this is my second Mac to go bad and I'm starting to get really disappointed.

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    Welcome to Discussions, alequihdez
    You have posted clear explanation of thorough troubleshooting!
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    Return your new Mac to see if the retailer as soon as possible.
    If he cannot immediately correct the problem, he may exchange it.
    If you bought from Apple on-line:
      http://expresslane.apple.com/
        - or -
      http://support.apple.com/kb/HE57
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