This could be a problem with your card if you don't have it on, or it would def be your monitor.
I changed monitors and still see the problem
have you:
1. Turned off 3D mode in the game's video settings.
2. turned down the game's quality.
3. changed the games brightness settings and lowered them.
And, how old is your GPU? And do you have any weird sounds coming from it? Or is it really hot?