I recently upgrade my PC to the GTX 570 and got a new 600w power supply with it.
For some reason whenever I enter a fullscreen game such as Smite, League of Legends, Diablo 3, etc...and then tab out or quit the game, my screen resolution changes. The entire screen is the same, but the text is a bit blurry in my browser and the screen in general (but not for the games...).
When I turn my monitor off and on, it says the wrong screen resolution as well. When I go to change the resolution, it's exactly what it should be, but is wrong.