I have an ASUS M3N78-VM motherboard. It runs Nvidia GEO force 8200 video and graphics. I have my monitor connected to the DVI port. I tried to connect my HDTV to my pc with a HDMI cable. When I plug in the cable I lose the DVI and the monitor isn't recognized any longer. The TV works just fine. I can't detect the monitor, it is as if it didn't exsist. When I unplug the HDMI the monitor is recognized and returns to working properly. So what's the deal??