Can not play videos through a projector.?

Question

He is trying to play movies to a projector using a powerpoint presentation he has. His computer shows fine on the projector, but when he tries to play the video, it shows on his computer but not the projector. As soon as the movie is stopped, the projector will show his computer again. This used to work a couple of days ago, but system restore did not help. He tried using a different projector of his, but the same thing happened. We now think it is something wrong with the computer. We tried using different fn - f8 combinations, but to no avail. What is wrong?

Dell model number: Latitude d620

Toshiba projector model number: TDP-T45

He is not using usb, but is using the cable with lots of pins (I don't remember the name).

He is also using Office 2007 professional.

Answer 1

This doesn't sound like a hardware problem to me, more like something that isn't configured correctly in whatever program he is using to display the video.  Is he playing the video within powerpoint?

Not that it really matters, but the cable is likely to be either SVGA or DVI.

Answer 2

is the video hes trying to play copypotected ifso the projector may not have digital rights the plug is called vga and if the video is copyprotected or in hd the projector will just go blank