Connected my PC uo to my PV500 via a normal 15 pin monitor cable, can see the desktop on the TV, have downloaded some of the HD demos from Microsoft and have succesfully played the 720 files through Windows Media Player. I can't seem to get the 1080 files to show on the TV though. I get the Windows Media Player background with the menus and the bar that scolls along the bottom that shows something is playing but the window in Media Player is just black, with no picture. I can see it playing on the actual PC desktop in Media Player but just not on the TV. Any ideas what I'm doing wrong?