I upgraded to Windows 7 a few days ago and everything seemed to be fine. Earlier today i left my PC on and when i came back an hour later the computer i accessed the computer, the monitor came on fine, but all my icons were missing. i tried to reboot and from that point on the computer appears to boot (all lights are working and the drives are going), but the monitor is never receives any input. I know the monitor works but is says there is no input. i am using a Sony SDM-P234 Any ideas?