Can't connect new TV to cable
The TV is brand new and works fine. Connected it to Wi-Fi and it gets a great picture with Samsung TV Plus, Netflix, etc. The cable provider is Xfinity, and the box is an Xi4. Main (DVR) box is in the family room, is powered on, and that TV works fine. Coaxial cable runs from wall to Xi4, Xi4 is plugged into power. New AudioQuest (chocolate) HDMI cable runs from box to TV's HDMI 1. HDMI 1 works with Chromecast; it's not the port. Xi4 works with another TV; it's not the box. Cable works with another TV as well. So, all components have been verified functional.
Samsung support tried everything. Went to Settings > Source on the screen, selected HDMI 1, set it to our cable provider... nothing. Black screen in the setup video box. Xfinity could see that no signal was going to the TV, tried a reset, didn't work. Escalated the problem, they tried; still didn't work. We've unplugged and reset more times than I can count.
It should be so simple! Connect via suitable HDMI cable, power on the box, TV should recognize it - but it doesn't. I'm super-frustrated. PLEASE HELP!!!
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