I've just reset a Windows 10 PC, in order to pass it on to someone else. It's a Microsoft Surface Pro 4.
It's now prompting me to set it up, starting with selecting the language.
I want to shut it down, to send it on to its next owner, who will do the set-up.
No amount of holding down the power button is actually turning it off.
Are there any tricks, please?
(I'm worried that if I let the battery go flat, and it won't boot, it might be considered a security risk if investigated in the post)