There may be some situations where you may need to restart or shut down your Windows system urgently. This could be an emergency situation, where you need to instantly shutdown or restart your system – or there could be a situation where your Windows just will not shutdown normally.
If you need bring your system offline and don’t have to worry about saving any work or current information, while using the physical Power can be one option, it could cause damage to your system. A better alternative to performing a hard reboot would be to follow this procedure.
I am aware that this is not something new, but has been a feature in the Windows operating system for quite a while now.
Emergency Restart Windows
Press Ctrl+Alt+Del to bring the logon information screen. This will display Lock this computer, Switch User, Log off, Change a password and Start Task Manager options.
In the bottom right corner you will also see the Power off or Shutdown button. Press CTRL and click on the Shut down button.
On the next screen, Windows will display the following information:
Emergency restart. Click OK to immediately restart. Any unsaved data will be lost. Use this only as a last resort.
Clicking on OK, will instantly restart your Windows 8 system.
Use this option with caution. Although it will not harm your Windows computer in any way, unlike a hard restart, when you exercise this option, Windows will restart instantly without giving you any warning, and unsaved work or data if any, will be lost.
How to force a full shutdown to reinitialize Windows 10/8 may also interest you.