Hard resetting computer, stuck on 94% installation.

Was full resetting my brothers old computer and it was at the installation process after multiple hours. However it stopped at 94% and it’s been there for a few hours.

I want to try again by resetting it through a usb but I literally can’t do anything as it’s stuck on that blue screen telling me it’s Installing 94%, even when I turn it off.

Anything I can do folks?