MacPro cursor icon corrupt

I have a new MacPro Quad core 2.8GHz system which is displaying a corrupt cursor icon. The cursor pointer has a noisy "grid" of spots extending to the bottom and right of the pointer. The grid size is approximately 5 times the size of the cursor pointer. The noise flickers over time.
I've tried the included hardware test application and no problems were found on the short test. When booting from the test disk, the cursor problem went away.
If I change the cursor size in Universal Access, the noise goes away approximately half way to the largest cursor and returns when I go back to "normal" size.
Changing screen resolution and rotation does not affect the noise. The noise persists.
Any ideas? Bad video? Bad RAM?
Thanks,
Chris

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!http://img.skitch.com/20090209-rs3au5tgcta9s3mdkq8aub7rad.jpg!
!http://img.skitch.com/20090209-gd1ub686tpytdg4sxbmk19x97w.jpg!
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