Cannot get dual display working
So one of the PCs in my school will not display correctly with our projector. We have a Dell OptiPlex 760 with a Core 2 Duo running Win 7 and onboard video. We also have a ceiling mounted projector and when I tried connecting it to the projector using this VGA splitter it will not work with the PC monitor and projector at the same time. If the splitter is plugged into the projector it will display the PC through the projector, but the only way to get the computer to display on the PC monitor is to unplug the splitter. Any ideas on what would cause this?