When i try to wake my macbook after sleep the keypad lights up but the screen stays black. I have to switch off and restart. How do I fix this?

After my Macbook goes into sleep mode it sometimes won't wake. The keypad lights up but the screen stays black. This problem has only occured after updating to OSX 10.7.2.
All I can do is switch off and restart. Then any programs I have not 'quit' all open.

OK, I have a fix.
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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When i try to wake my macbook after sleep the keypad lights up but the screen stays black. I have to switch off and restart. How do I fix this?

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