okay... so this means it's your computer and we can exclude the disc.
It's your videocard.
the minimal requirement videocard is according to the blizzard website
Quote:
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8 MB 3D video card (TNT, i810, Voodoo 3, Rage 128 equivalent or better) with DirectX® 8.1 support
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.
There is a videocard-tester located here:
clicky
I did found some kind of simillar (sp?) problem:
clicky
I would advice you to try another videocard. If you're not a complete computernerd i can understand that you don't have a spare one.... Games like BattleField 2 or anoy other high quality game does work?
My notebook's screen is also very dark when playing WarCraft III, but i can still see everything....
Good luck!