Hi! I already have Xfinity internet. I cancelled D-TV to add Xfinity TV. Self-install disaster. Followed all instructions to setting up 5 boxes. Error message reads no signal tighten cables (which I’ve done). Switched Coax cables around, moved around HDMI cords also, watched the videos, went to YouTube. Still says no signal. I cant get a live person with Xfinity, not even a call back. Help please
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