Yes, i am connected to one television. I checked HDMI cable for tight connections. Also checked the cable with other devices, it works with them. Tried other HDMI inputs on tv. Also disconnected everything, rebotted cable box etc. None of them worked. Only AV cable works. I assume id has to do with HDMI output of the cable box. Comcast not helpful at all. Can i just take the cable box to the nearest service center? Thanks for your reply.
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