The installer said we could still view the programs on our old PVR after we had the Gateway system installed. However, when I tried connecting the old PVR to one of the available HDMI ports and turned on the PVR, the on screen message said no signal available. I checked to be sure I had the source set to the correct HDMI connection. Do I have to hook up the cable to the old PVR? Would that make it work?