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no picture or sound on any of comcast videos I want to look and listen to.

New Poster

no picture or sound on any of comcast videos I want to look and listen to.

I do not have picture or sound on any videos I open up on my Xifinty home page on my home computer.Please let me know.I am able to see and here from the other on line companies.

It started today 9/28/2017.Thanks