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Crystal UHD 7 Series TV will not recognize HDMI devices

Hello! I have a Crystal UHD 7 series TV and a couple weeks ago the cable stopped working. I thought it was a problem with the cable box so I got a new one sent and installed and the cable still won't work. I keep getting the HDMI error message of "No Signal". I spoke with Xfinity again today and they did a pretty detailed test of the system and determined that nothing is wrong with the box. Purchased a new HDMI cable just to play it safe and still not working. I've read some threads and am wondering if there's a problem with the main board or HDMI connectors? I've only had this tv for 5 months! Help!