Here's how you can create your own one-click shutdown button for the Windows 8 Start screen. 1. Go to your desktop. 2. Right click and create a new shortcut. 3. Type in the following for a shutdown button: shutdown /s /t 0 4. If you prefer to use a restart button instead of shutdown, type in this (t instead of r): shutdown /s /r 0 5. Name your new shortcut, choose an icon for it, then pin it to the Start screen.
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Windows 8 Tips & Tricks | Tom's Guide