If you purchased a cable box from ebay craigslist or any other re seller comcast will not activate it because it is actually an un returned rental.
Comcast hd cable box troubleshooting.
Comcast customer service is here to provide help and support for your xfinity internet tv voice home and other services.
This video will show you two ways to reset your comcast xfinity cable box specifically the x1 cable box.
Learn about replacing your equipment now to get the most out of your xfinity service.
The coaxial cable should be firmly connected to the x1 tv box and wall jack.
The video cables between your tv and x1 tv box should be firmly connected.
Learn more about your comcast tv box and download the user manual here.
Having problems with your remote control.
If you re using a v cables instead plug each cable into the same colored port on the back of the box e g plug the yellow cable into the yellow input.
Plug in one end of the hdmi cable.
Replacing your tv boxes and modems faqs.
You should only get cable boxes directly from comcast for new service replacements or additions.
Hd troubleshooting for your non x1 tv box.
Make sure your hdmi cable is plugged into your tv and the hdmi out port of your x1 tv box.
It goes in the wide narrow port in the back of the cable box.
Learn some tricks for resolving the most common issues with these steps.