There is no cables to my videocard, cause i have notebook. Dxdiag is also didnt find problems. And also, shouldn't i was unable to run games completely, if that was power supply problem? I still can launch any nonunity and non unreal engine powered games even if they quite demanding. I still able to play CS, Dota, Sacred 2, WoW, without need to make them into window or change to battery saving mode.So check your power supply, try another one and check your cable connections.