24" iMac wavy video

I just purchased a 24" iMac for a friend of mine and she has noticed that when she scrolls a
web page, a portion of the page shows a rolling "wavy" area on the middle of the screen about an inch wide until she stops. My friend has only one good eye and this is making her nauseous. Could this be a graphics card issue or something more serious?
Thanks,
Dave

Found out this weekend that my friend's system has the NVIDIA GeForce 9400 card.
So the new FW won't fix the problem. Any other suggestions?
Thanks,
Dave

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