Vertical Dark areas in the screen

Hey all-
The screen on my MBP has some dim areas that run vertical across the bottom of the screen. They aren't lines, more like shadows. What is that?
Help?

I intermittently get these too.
I have the GeForce 8600M GT video processor that Apple will replace for free, but this seems to be an OS X issue regarding this processor. When I boot to Vista it goes away.
Apple has noted this problem with earlier versions of OS X, so they're probably working on a fix. If it starts to happen more often I will try the GeForce 8600M GT replacement.
In the meantime, this article describes how to reset the display:
http://support.apple.com/kb/TS1258
Rod

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