winegard

I have the Winegard Sensar (replaced the head about a year ago). It worked OK for a while. Now I seem to have problems finding channels again. I checked the coax connector at the head and on the back of my video control selector. One thing that I noticed is that the power indicator lamp on the video selector goes out when the cable from the antenna is connected to the video selector. Does this imply a short in either the head or the cable? I am going to try a different piece of cable this weekend and see if the results are the same.