Question about Onkyo TX-NR7100

Mine behaved similarly strangely once. I assume you have completely disconnected it from the mains (including the power cable for a minute or two)? That helped me at the time and it hasn't happened again since. If it doesn't help, I don't know of any other solution.

I entered the following in the Google search:https://www.google.com/search.
Before all attempts, the trick with the Cable/Sat button should work.
Hundreds of advice can be found on Google search.
Max

It is best to reset it to the factory setting, then it should work again. otherwise it must be taken to a repair workshop