I am running a 4100MP Projector attatched to a PC, DVD Player, and a VCR in our training room. It is used everyday during the work week for our new employee training. The PC is the main unit that is used for training...but from time to time we use the VCR for a video. When I want to use it I press the source button on the remote and it finds the VCR (Attatched via RCA cable). Issue is unless the Projector powers on to the VCR only the video is messed up and will not display. If I boot the projector up to the VCR and change to the PC I cannot go back to the VCR or the same issue occurs.

 

VCR is displaying at 60 hertz and the PC is at 75hertz. can it not flip back and forth? If not how do I fix this?