Weird black flashing on monitor

Hey guys, well my problem is that whenever I game, (particularly FPS games), certain dark spots of the game would flash if my character is moving, or looking around. This happens all the time, but particularly when the dark/lights are contrasted (a dark vent against a light wall, dark pixels on the floor, walls, ect ect). I tried disabling SLI and HDMI settings, but it does not work. Even old games such as system shock 2 have the same problem. This also happens in my windows explorer, and browsing websites too. When scrolling up and down through folders, the dark icons would flash quickly. When scrolling through dark pages that are contrasted with light parts, the dark also flickers. I have a 9800GX2, and a 42" Sony Bravia as my monitor. What can I do?

It's kinda like gray flickers to black back and forth

come on anybody?