A projector to a computer? That's a way off topic. This is the car audio forum. Anyways, what kind of computer is it? What's the brand of projector? If it has svideo or rca plugs for input, then use those. Of course the computer's video card must have svideo/rca out. If the projector also comes with 15pin plug (vga), then connect the computer's video to the projector's 15pin(vag) input. Then you will be able to view whatever's on your computer screen.