Keyboard shortcuts to shut down or sleep a Windows 8 computer
Put your Windows 8 system to sleep or shut it down
Here's how you can quickly shut down or put your Windows 8 computer to sleep.
1. To force a shut down or sleep:
Ctrl-Alt-Delete then press the power button in the bottom right corner.
2. Or you can use this alternative:
Win+I then press the power button
For more, see the original article at the link below.