Hello. I'm trying to connect a new JVC JLC37BC3002 to a Comcast cable box by HDMi cable, however, it just says No Signal. I have the main coaxial cable connected to the Cable In and an HDMi cable connected to both the television and cable box. When it scans for channels it finds nothing and continues to display No Signal. I contacted Comcast but they were no help. Any suggestions? Thanks.