I'm sorry, I just noticed there's another section for monitors, called displays, maybe a mod could please move my thread there ?
Also about my problem, well I don't think that's my problem anymore.
Now I discovered that my monitor has this green tint in games, while I don't think it's that...
So I got this new monitor, Dell P1130 21", and I did a color return because everything was a little pale, and it was ok then. After that I went away from the computer and when I returned it was you know, turned off, and when you hit a key on the keyboard or move the mouse it turns back on. Well...