Find it very odd my Xfinity box stopped working at the exact time I install a new TV.
I did unplug all connections on the box for a hour while I setup the TV.
Hook back up and the box has no power. Did check all connections. And used my meter to confirm The power suppy cable to the box is working.
And with only the power cable connected I get no lights of any kind on the box.
Almost like unplugging and moving it caused it to go bad. Box about 5 years old.