I agree with Lew here. Mine did the same thing - not supported message. Gave the cable guys a call and if they came and it wasn't them $75. But go buy a HDMI cable. IT’S your cable, still have to buy it. CT 12.99, dollar store 3.99. The cheap one works fine. And after buying it I find two in a drawer.
Worth try if the connection is gone. Can always return it.