I have a new pc and for one months everything was going well until now. Whenever I try to start a game or my 3d screensavers, a black screen appears for one second and then it goes back to desktop screen. When I bough the pc I set colors to 32 bit. But now it wont work anymore. However when I change it to 16 bit it works fine with all games and scrensavers. I have geforce 9800 gtx+.