jarhead

For some reason the Vizio tv in my Oliver will not recognize that I have the cable plugged in. It keeps telling me to check the cable which I have done and I have the button in the cabinet above the TV set to the correct setting which is off for cable. Any suggestions to what I am doing wrong. We cannot get any channels. Also I can never get any air channels either. My other MOTORHOME would receive air channels in my driveway. My Oliver will not.