We have a 2300MP projector in our office and a number of laptops.  For some reason the projector will not detect a source on the VGA port on our Acer TravelMate 4000 laptops.  Our HP, Compaq and Toshibas all come up with no problems.  The external display works properly on the Acers on projectors in other offices as well as monitors in our office.  We've tried updating the display drivers but still have the same problem.  S-Video from the Acers to the projector works but the image quality isn't very good.  Any ideas?