I've having a few issues with my computer that I think are related to my video card (Nvidia 7900 GT). While gaming my screen glitches out and I see a bunch of grey static. When I leave my computer on overnight, the monitor doesn't respond and won't turn on in the morning. The only solution to both of these situations is to restart my computer. The 3rd problem I'm having is that my computer will restart for no apparent reason on occasion. My first thought was that my video card was not getting enough power, but everything is plugged in including the PCI power slot on my video card. I also have the latest drivers. Is there anything else that might resolve these situations?