I just built a new computer system, and i'm having some trouble with getting it to work. I think i hooked everything up correctly, and when i hit the power switch, the computer seems to turn on (the fan starts running, the 3.5 drive sounds like it's working). However, the monitor does not seem to recognize the computer, it stays in "power saving" mode as if the computer were turned off or not connected at all. I see the numlock/capslock lights flash briefly, so i think the keyboard is getting recognized, but the USB mouse does not turn on either. What could be causing the monitor to not be detected?