NVIDIA problem - black screen

Hi,
I've got a MacBook Pro 17inch, early 2009 - and since I've installed the latest Lion Updates my Mac has got strange problems with the graphic card(s).
The first time the screen kept black after I wanted to wake it after sleep mode. Restarting several times could not solve the issue. So I waited half an hour, tried starting it again and it was all fine - like nothing ever happened.
After a few days the black screen issue came up again - and I couldn't figure out, how to solve this (other than restarting and restarting and restarting ...). You can hear the typical Mac startsound, but then nothing happens.
I'm not able to see a pattern here, because sometimes my mac boots completely fine but randomly refuses to work at all.
Since today I can't activate the bigger NVIDIA-card in Lion - it's not even mentioned in the system informations (there is only the GeForce 9400M and no other card).
I would reinstall Lion, but I'm not sure, if this could crash the whole machine. Because, if this is a hardware defect, I'm afraid the Lion installation can't switch between both cards if necessary.
I searched on Google and there were several articles about a similar issue (with a black screen and no chance to get it work again) and some guys wrote, there was an issue with NIVIDIA cards from that time and that Apple extended the warranty up to three years for Macs with that problem.
My questions:
What can I do now?
Is there a chance of getting this problem fixed without paying 800 € for repair?
Would you think it's a hardware problem, or is it because of the latest update?
Thank you for your answers!

fublador wrote:
My questions:
What can I do now?
Is there a chance of getting this problem fixed without paying 800 € for repair?
Would you think it's a hardware problem, or is it because of the latest update?
Thank you for your answers!
1 - Take the computer to an Apple store or an AASP.  Whichever is more convenient for you.  Let the staff properly diagnose your issue.
2 - If you want to DIY - Do-It-Yourself Laptop Repair
Research YouTube's 'How To' video tutorials
FixYa
3 - To check for hardware issues, boot up from your system disc that came with your computer and run the Hardware Test - Intel-based Macs: Using Apple Hardware Test

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    Quote from: Henry on 31-August-09, 07:17:04
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