Gray screen with lines after waking from sleep or opening lid after closed

I have a 2.4 gHz Aluminum Macbook (Late 2008) with backlit keyboard running Lion. Every time I wake it up after the screen goes black or when I open the lid after I've been gone for a while, a gray screen with thin vertical colored lines appears (the lines are in different positions every time). I can hear sound when I press the volume buttons and I can eject CDs. Usually it fixes when I close it and re-open it. When I'm working with multiple monitors, it is nearly impossible to get out of- I have to unplug the Mini Display Adapter and THEN re-open it.
All I have seen on the internet is to update your OS but mine is completely updated. Maybe the screen is going out? I've reset the PRAM and SMC with no luck.
Any help would be appreciated, Kolton

My March 2011 MBP did the same thing.
After spending about an hour online with Apple Care without success, I did a reinstall of the Lion OS. It fixed the problem.  I was concerned that I would lose data or settings, but the reinstall was seemless and everything was the way it was before the reinstall except that the "black screen on wake" problem was fixed.
I started the reinstall before I went to bed and it was waiting for me the next morning.
Here is a link to the page on how to do the reinstall:
http://support.apple.com/kb/HT4718?viewlocale=en_US&locale=en_US
Hope this helps.

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