Windows Vista Media Center with Media Center TV Pack installed: Black screen occurs when playing non-protected DVDs in Clone Mode
Consider the following scenario. You have Windows Vista SP1 with the Media Center TV Pack installed. You have multiple monitors running in Clone Mode (displaying the same image). You try to play a DVD in Windows Media Center. The DVD contains non-protected content.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB963034.