The display on my MacBook won't always turn on after coming out of sleep

Just 10 min ago i had to use the bathroom. I closed the lid of my MacBook. When I came back I opened it up. The disk drive made the usual noise, the fan turned on, and keyboard lit up, but the screen didn't turn on. So then I held down the power button until I heard the fans go off. Then I hit it again and the macbook started up like when it would after hot swapping the battery. The MacBook was also charging during the entire time.
What is wrong?
Any suggestions?

Yes my issue is that, for any extended period, the display won't turn on at all - a hard reboot is required. And it went away if the total number of ram is 3gb or similar (not matter what bar of 2gb ram I used) so possibly the ram is not the cause - i also have test with memtest & apple hardware test (extended / loop-mode)
I'm thinking of installing windows 7 / vista in bootcamp to see if the problem occurs to figure out if this's drivers / software issue with mac osx. I will come back and update on this later.
I have rung apple support and they tell me that only apple certified ram will ensure compatibility and the said that ram is the issue - I used OWC ram (which never had any compatibility issue before).
Stayed tune!

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