Alright, so I just built my first computer, so of course I've run into some problems. Everything appears to be working (fans are spinning, Blu Ray drive is working, etc) except I'm not getting any kind of video. When I turn it on the "No Signal" message on my tv will disappear briefly, then reappear. So it appears that it is attempting to output something, or at least has some power go through the HDMI cord, but I get nothing. Anyone have any idea what might be causing this?