The only thing that is going to happen, your monitor get dark. If you go outside and its day time, while everything is set to 0. You're not gonna see much. But if you're inside where lighting is very little, and your brightness/contrast is at 0 you'll still get a decent image. Not only that but you'll also save on battery
life (if your using a laptop) so computer will last a few more minutes. That's pretty much it, it won't negatively effect your computer in anyway. More like doing it good if you decide to run in battery mode.
Edited by johnlee, 15 June 2011 - 09:04 PM.