If you see a Reboot and Select proper Boot device. Or Insert Boot Media in Selected Boot device and press a key message on Windows 11/10, see this fix.

Forums › Desktop computing › "Reboot and select proper boot device or insert boot media in selected boot device and press a key" Ivashchuk303 2 posts Wannabe Geek #25380 20-Aug-2008 02:35 ...

I'm stumped. Yesterday morning my computer was working fine. I stepped away for a few minutes, and when I came back it was on a black screen of death saying "Reboot and select proper Boot device ...