Option "Settings" in Menu is not active (grey)

I tried to put my screen protector on, when the Kindle (7-th generation) was starting. So now Option "Settings" in Menu is not active (grey) and it does not go to sleeping mode, but goes to teaching mode instead of screen saver. When Restarting it also goes to teaching mode. Computer does not see Kindle. And I don't know what to do.

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