My system has recently (within the past few weeks) developed an issue where it has a black screen when displaying any type of video in Media Center -- live TV, recorded TV, DVD playback, videos -- all now have a black screen.  With live and recorded TV, I only get a few seconds, or less, or audio before it cuts out also.  With DVD and video files, I get sound okay but black screen for video.

 Videos and DVD's play just fine with Windows Media Player 11.

I have a Linksys Media Center Extender, and I can use it to watch recorded TV off of this computer just fine.

 I am not sure if it is related, but it seems that this issue began about the same time that I upgraded Office from 2003 to 2010.

Ideas?