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You can use the power button to restart your computer three times. This will start the Windows Recovery Environment. "How To Access Advanced Startup Options in Windows 8 or 8.1" http://pcsupport.about.com/od/windows-8/a/open-advanced-startup-options-windows-8.htm " How to Boot to Advanced Startup Options in Windows 8 and 8.1" black screen after login windows 10