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Hello, I'm Shahid and will be happy to assist you. This error message mostly appears due to low speed or defective HSMNI connection cable.
- Have you tried high speed HDMI cables to connect Comcast and DVD player to TV?
If so, have you tried to unplug TV and cable box power cords from wall outlet for 10 minutes to reset, replug back in and check?If not yet, can you try it now and reply back with the result?