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.

Fix The selected boot device failed, Press to Continue error in Windows 11/10. We suggest two solutions that are sure to fix the problem for you.

Made bootdisk stuck in disk #1. Still same "Reboot and select proper Boot Device or Insert Boot Media in selected BootDrive and press key." message. <BR><BR>I dont know what could be wrong.

Before, when it was 'working' I had the BIOS set to 'Other OS' and every time it booted it would say "Reboot and Select Boot Device", and I would need to reboot, hit F12 and say "No, please boot ...

The BIOS varies on each computer. On some models, for example, you may need to select an option such as "First Boot Device" after accessing the hard drive boot menu to change the primary hard drive.