Here is my problem. A few months ago, while trying to play an online game, Counter-Strike:Source, my graphics began to go all funky. Different colors, black boxes covering the screen etc. Soon after that, some of the pixels on my monitor started turning pink and green. I have 2 Nvidia 7900GT's. I ran them in SLI twice, other than that the other one just sat there. I've reformatted my computer, several times. I've upgraded my drivers a few times. I've tried switching my graphics cards. Nothing has fixed it or made it any better. Within the past few days, I've received an error at start up saying that my Graphics card isn't receiving enough power. Any help would be great on what the problem could be. Thank you!