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.

3)Type shutdown /r /o in an elevated CMD prompt to reboot your computer into Advanced Boot options or Recovery console. No CMD as it is a reboot loop. Please learn what a reboot loop is.

Restart the computer and use the "F8" key to boot to the Windows recovery window. Click or select "Troubleshoot," then the "Command Prompt" option. Type "SFC /scannow" at the command prompt and ...

With a computer, smartphone or tablet, waiting isn't usually needed. However, if there is a really persistent problem, shut the gadget down and wait 30 seconds to turn it back on.

If you find an error, try restarting your computer to see if that fixes the “Your PC ran into a problem and needed to restart” issue. 16. Perform a System Restore ...

Microsoft is investigating a known issue that triggers Secure Boot errors and prevents Surface Hub v1 devices from starting ...

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Restart the computer and watch for the first flash screen to appear. Look for the Setup function key description. It will be “Setup F2” or F12, or something similar.