For a detailed guide, follow the respective fixes to learn how to fix Windows 10 not shutting down issue.If some of you are wondering why is Windows 10 or PC not shutting down, check out the causes first.Full stepsīoot PC from Safe Mode and change BIOS settings (in Fix 5 and 6). Enter Safe Mode, Cancel Automatically Restartīoot PC to Safe Mode, open sysdm.cpl, uncheck 'Automatically restart'. Type troubleshoot in search > Select 'Troubleshoot'. Run Command Prompt as administrator > Enter: shutdown /s /f /t 0. Open Power & sleep settings > Additional power settings > Choose what the power buttons do.