I've had similar issues with my TV.
Unplug everything. Don't reconnect anything. Except.
Connect the TV directly with the RG6 (black round wire).
Of course plug in the TV again and try this. Use TV start button if you can find it. There may be a manual (on TV) MENU button. Make sure that you are on the TV and not some other accessory listed in the MENU. If you have the actual remote that came with TV make sure new batteries and try that.
In other words try the TV alone as if there were no other equipment attached.
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