My Dell XPS 9000 went out the other day. While switching users the screen went black. Nothing seems to bring it back. When booting there is no indication (video) on the screen of POST activitiy. Eventually there is a black color shift on the screen and the mouse cursor appears. I can access my hard drive through another networked PC so the drive seems to be OK. Once on boot I got a 5 tones, up and down in pitch, followed by 3 sets of 2 beeps. Can't find that response anywhere. I reseated everything inside the PC but didn't help. I tried to boot up in Safe Mode but haven't been able to do that yet. When powering up, there seems to be a lot of hard drive activity before it settles down- seems to be about 3 or 4 minutes. It's a Dell XPS 9100, Win 7, NVidia GT 220 video card. I've thought about removing the video card and booting, but don't know if the PC will default to the onboard graphics. Any thoughts?