Macbook pro screen won't wake up after sleep

I'm having a strange problem that just started today.
I close my macbook pro lid and put it asleep. Then when I open the lid the keyboard lights up. The screen comes on for about three seconds and everyone looks fine then the screen goes to sleep again. If I close the lid and open it again it comes on for 3 seconds and goes to sleep again.
Occasionally I can get it to stay on hitting Function and brightness keys. But just as often it takes a hard reset to get things working again. But then if I close the lid and open it the problem starts again.
Any idea?
I'm running the lastest Lion update.

thanks. obviously i'd like to avoid such a time-intensive move before looking at other options.
To make things more intresting I've fund it ONLY does it when plugged into a charger.
AND if I briefly unplug the charger after the screen comes up black it immediately wakes up and stays on.
weird.
I've reset the SMC. But still get the same issue (if plugged in).

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3/10/11 7:33:53 AM kernel ring tail = 0x00001f58 ring control = 0x00003401 enabled, auto report disabled, not waiting, semaphore is waiting, length = 0x004 4KB pages
3/10/11 7:33:53 AM kernel timestamps = 0x32b5c
3/10/11 7:33:53 AM kernel Semaphore register values:
3/10/11 7:33:53 AM kernel VRSYNC: (0x12044) = 0x0
3/10/11 7:33:53 AM kernel BRSYNC: (0x22040) = 0x0
3/10/11 7:33:53 AM kernel RVSYNC: (0x 2040) = 0x0
3/10/11 7:33:53 AM kernel BVSYNC: (0x22044) = 0x0
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3/10/11 7:33:53 AM kernel VBSYNC: (0x12040) = 0x0
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3/10/11 7:33:53 AM kernel kIPEHR: 0x1800001
3/10/11 7:33:53 AM kernel kINSTDONE: 0xffffffff
3/10/11 7:33:53 AM kernel kINSTDONE_1: 0x3fffffff
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Macbook pro screen won't wake up after sleep

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