dvd wont play via projector

  widdy 19:07 05 Nov 06

I am trying to play a DVD from a NEC laptop.
It plays on laptop screen but not thro the optoma projector. Skin shows up via optoma but no video content

It will display thro the projector if played on my other laptop (hewlett packard)
its got to be on settings somewhere but dont know where to look
Help much appreciated

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