Unibody 15 " january 2009....screen goes black, won´t start/react

I have got this problem:
Working on the computer, screen suddently turns black. Computer still running i think as there are fan-noise.
This happens totally unpredictably, only thing to do is force quit by holding power button.
I saw the thread below regarding "...dont wakeup after sleep". This is not the problem here, the computer just turn black screen during work.
What to do ?
Really solutions please as my expensive laptop is almost useless when its not safe to use.
(If i remember correctly....this has happened only after 10.5.7 update, but im not 100 % sure about that)

I think your computer has the NVIDIA GeForce 9600M GT and 9400M, and not the 8600M GT that the older Macs have that sometimes gives problems. Nevertheless, there could be a problem with any graphics chip.
Again, you are under warranty, and if you do have a hardware problem with your chip, the only thing to do is to report it to Apple so that they can evaluate it and do whatever is necessary to fix the problem.
Good luck!

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