I have a MacBook (Intel Core 2 Duo) whose screen will not light up!

I have a MacBook (Intel Core 2 Duo) running on Mac OS 10.5.8. Recently, my display screen will go "nearly" pitch black. "Nearly" because I can still see the outlines of the windows and apps in the background. For a while, I was just restarting my computer or opening and closing it until the screen came back on. Then, my friend told me to use the dimming function to fix it. So far, it has worked, but only if my computer is on brightness level 0-2. Obviously this has been terrible for my eyes and is not a permanent fix.
I've been trying to find out what piece of my Mac is going to need to be replaced. I think it's a video chip, but I'm not sure.... Has anyone else had this problem and can they tell me how much it cost them to fix it? Thanks! (I'm in Japan with a U.S. bought Mac, so my problem is a bit compounded, but here's hoping!)

Ariel...
Try Resetting the System Management Controller (SMC)
If that doesn't help, it could be the graphics card.
Run the Apple Hardware Test

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