I am working with two teachers that have a ViewSonic PJD6253 in their classrooms. They use what's on their computer monitor to show up on the projector display. The projector only keeps the ViewSonic logo screen on the display. If the video source is switched and then put back to the computer monitor, the projector will display what's on the monitor for a split second and then it will go back to the ViewSonic logo screen. I do not know why the projector would do that or how to resolve it. Any help would be appreciated.