See if a boot to Geexbox plays the DVD movie.
My Win7 desktop with 19 inch flat screen monitor used to play dvds fine but lately it will not open the dvds, nothing no response.
 The DVD drive is Ok, I tested it in another computer.
 The dvd disc is ok, played fine in that drive in other computer.
 Music cds play ok in Media Center using the dvd drive.
 I installed VLC player to see if I could play the dvd. DOES NOT WORK with VLC player either.
Obviously something has gotten hosed in my Win7 installation but I dont know what to look for. HELP!!!