Purchased a Smart Tv and connected a new from Xfinity “anywhere HD box” meaning basic cable, no DVR. Using cable line and HDMI cable cannot get the TV to recognize the source. Thinking I should be able to change the input on tv to match the HDMI port and cable would just show up. I previously had an LCD Non HD TV and non HD box in same spot. So I know cable works on that outlet. Thinking it has to be a setting somewhere I’m missing.