I can say without any doubts that a new fiber optic cable fixes the turning on n off and the remote not available message. I bought a cable from Amazon and received a used bad cable that some meathead returned n Amazon resold. I had a suspicion about that cable since it did not come in OEM packaging. I returned that, got my refund, and ordered a new cable from ABT Electronics. New cable arrived today in OEM Samsung packaging. It has a much thicker white jacket and a lable of the company who made it as well as a date code which is Dec 2017. Plugged it in, plugged the TV back into the AC Mains, and the TV came to life and went thru it's boot up then had a message on the display about the remote paired sucessfully and all is good now.
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