We are now on the 3rd M7 model cable box and it won't activate. We tested the same TV and hook up with a different model cable box that we have on another TV and the connection and cables are fine and it works showing all our channels. We have tried calling Comcast and never can get a live support person to talk to in order to get this resolved. I can't believe that 3 boxes would be defective and so maybe this model doesn't work with a high def smart TV? Please help we are very frustrated and refuse to continue driving 40 minutes 1 way to the Xfinity store to have it swapped only for the same results. What is the definition of insanity???
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