You would think clicking the Shut Down button on your PC Start Menu would Shut Down your PC. That is not the case with Windows 10. It actually goes into hibernation mode which is what makes it faster to boot up. If you’re experiencing issues with your PC you’ll need to hit the restart button instead. Restarting your PC will fully Shut Down before coming back up again.
The reason your pc doesn’t actually Shut Down when you click Shut Down is due to the Windows 10 “Fast Startup” feature, which is enabled by default. You can perform a full shut down by pressing and holding the Shift key on your keyboard while you click the “Shut Down” option in Windows. This works whether you’re clicking the option in the Start menu, on the sign-in screen, or on the screen that appears after you press Ctrl+Alt+Delete.