Have you tried turning it off and turning it on again?
WYSHS
Beyond the typo, I’m going to assume that he knows what “reboot” means.
You missed the joke.
Well if you aren’t going to explain it then I don’t want to hear it.
It’s just that tech support will often blindly ask “Have you tried turning it off and turning it on again?” so often that it’s become a cliché.
No wonder I missed it, it wasn’t even a joke.