SOURCE: I have a viewsonic pj510 that has worked fine for months.
Hi Leo7
Try right clicking on your desktop and going to properties.
Then go to advanced and check in the window with the two screens in it if the secondary screen/monitor is attached - it should be attached.
SOURCE: my hp laptop plays the dvd but the viewsonic does
Try pressing the "Fn" function key, holding it and pressing a key on the laptop in the "F" series that either says CRT/LCD or something similar to get it to show up on the projector. Let me know if you are still having trouble.
Benjamin
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