I have a Comcast Xfinity DVR box plugged into HDMI Port 1. Every time I turn the TV on, the TV responds as if the box is not providing a signal. I've troubleshooted following guidance on similar posts. The only thing that works is unplugging the HDMI and plugging it back in. I've swapped out the cable box with the same issue again and again. Old TV (a 2013 Samsung) had no issues. Please help.
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