I am using a GeForce4ti4200 graphics card, on the VGA output I have a SONY VPL-S500U projector, on the DVI I have a 19" monitor, also set as the primary video display. I can view and run programs on the seconday display, but when I try and watch a DVD movie, using CyberLink DVD XP, I cannot see the video displayed on the projector, I get the DVD player window, filled with black. If I drag the window back to the primary monitor, the video shows up as normal, I would like to be able to watch a movie without having to switch the primary display and logout/login everytime that I decide to watch a movie, any suggestions?

You may find that the screen format for the DVD Player is 'out of range' for the Projector. Most DVD software players run at a relatively low resolution, a mere 640 x 480 in some cases, which possibly is unacceptable to the SONY. Try to set up the DVD player program to 'fit' the SONY's input needs.

An afterthought: Have you tried pushing the AV output to a TV? Is this working OK?

Most DVD's will not allow you to output it to the TV since they are assuming that you are attempting to make a duplicate copy of the DVD, copy protection SOB's >:-( I can hook the projector directly up to my computer or set the projector as the primary display and it will work, but if I try to do anything at the same time, it continually places the newly opened program over top of my movie, not to mention it's an annoyance to try to logout/login everytime you switch primary displays.

I did a search on MS's website regarding this issue, I usually try to avoid their site, cause it gives stupid generic explanations as to why something it happening... Once again I was proved right... It tells me that there is an issue with Direct Draw and the extended desktop, although it lists a couple of possible solutions they don't work. Here is the link to the website: http://support.microsoft.com/default.aspx?scid=KB;en-us;325771&