Television suddenly has no more channels?

I've had my TV for a while and so far it has worked flawlessly. Last night, I wanted Netflix to return to normal TV programs, but suddenly, "No channels have been added yet, go to the installation menu to add channels."

I have already done a manual and an automatic channel search, but did not help…

Do you know why that could be?

Pull the power plug for 10 seconds and then plug it back in and turn it on. If that does not help then he is probably really broken.