Please try these steps and let us know how it goes.
1. go to power options in control panel 2. go to left side options in what does power button do 3. click on the link "change settings which are currently unavailable" 4. uncheck fast startup option recommended by windows 5. save changes 6. try to shut down now
Also was there any hardware or software changes done recently?
Also in advanced power setting disable any hibernate or sleep option by checking each manually.
Do provide us your system tag#, email address and name via private message,by clicking on my name in blue and then select send a private message