Since Windows 8.1 and through Windows 10, a feature call Fast Startup has been an option on Microsoft's Operating Systems. The feature is used to speed up the Operating System boot process by being a hybrid between a System Shutdown and Hibernation.
Fast Startup in Windows discards all your open programs and files (as it would during a traditional shutdown), but it saves the state of the Windows kernel to the hard drive (as it would during hibernation). More information can be found in the following location: Distinguishing Fast Startup from Wake-from-Hibernation
The following methods should be used if a Shut Down is needed while Troubleshooting Windows software issues.
shutdown /s /f /t 0
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