Hello, recently while starting up games, after loading some of the scenery is blue and soon after the game freezes, on occasion it will come back and still have great fps but constant freezing/ lagging. Is this a video card problem or could i be a bad power supply not producing enough power? my specs are, Evga GTS 450, 8gs of ram, phenom 2 quad, biostar A880G+ mobo, and a coolermaster elete 460W power supply