DVD Black screen (Sound only - no menus)

  Flat Face 12:11 25 May 03

I am having problems running DVDs.
If run from autorun selecting WinDVD the programme starts with Real One but apart from sound the screen is black.
I also have Windows Media 8.0
I have tried turning layers off but to no avail.
The DVDs were running OK in March.
Recently I installed a Compaq 5500 monitor to use my Toshiba Satellite 1800 like a desktop and installed the proprietary Compaq software.
If I go from Windows Explorer and explore the DVD I can run and see and hear the DVD using Intervideo WinDVD, but have to load each chapter separately which is a real pain, especially as they only have coding and not easily identifiable chapter headings as in the usual menu.
Any ideas?

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