check drivers and all connections...could be a booty cable...verify resolution and any eye candy...what game is that anyway?
I used driver cleaner pro and uninstalled the new nvidia driver. The monitor is fine, i tried it on another one and it does the same thing. I installed the 84.21 drivers. Everything is default atm. When i am playing that mod, and some other games, I can see a clear box which looks like the draw distance. It shows when the image will become clear.