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New cable box HDMI ports do not work

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New Poster

New cable box HDMI ports do not work

I hooked up my new cable box last night as instructed. My TV keeps telling me 'No Signal' at all 3 HDMI entry ports on the TV. I shamefully resorted to using the RG6 that was sent with the box. This worked but I obviously have no HD channel capabilities. Any help or advice here will be appreciated.

Silver Problem Solver

Re: New cable box HDMI ports do not work


@JerAmyV wrote:

I hooked up my new cable box last night as instructed. My TV keeps telling me 'No Signal' at all 3 HDMI entry ports on the TV. I shamefully resorted to using the RG6 that was sent with the box. This worked but I obviously have no HD channel capabilities. Any help or advice here will be appreciated.


Are you sure you are using the correct HDMI port on the cable box?

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New Poster

Re: New cable box HDMI ports do not work

Yes sir. The back of the box has a Cable In, Cable Out, HDMI out and the power jack input. Those are the only ports on the back of this box.

Official Employee

Re: New cable box HDMI ports do not work

It’s possible that you have a bad box, swap it out at your local Xfinity store. Also, check with a different HDMI cord just in case
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Official Employees are from multiple teams within Comcast: Product, Support, Leadership. We ask that you post publicly so people with similar questions may benefit from the conversation.

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New Poster

Re: New cable box HDMI ports do not work

Thank you for the advice. I tried 2 different HDMI cables. I believe it is a bad box.