I just got a new graphic card nvidia 8800gt and installed it and it has place for extra power so I hooked it up. At first it worked fine but then all kinds of stuff happened to computer, green kind of lines and everything just quit. I thought maybe it was some programs I recently got so I uninstalled them and it still happened. So finally I removed card (which was real hot) and put old one back in and problem went away.. Does anyone know what happened and why? Also installed new power supply corsair 550 watt..