Googled "windows 10 stuck on restart, cold boot works"
From one page (gives clues) te check what hung up..
This is a very simple fix ladies and gentlemen. If your Windows 10 session gets stuck during a system restart, press CTRL + ALT + DELETE.
Afterwards, the restart screen will disappear and be replaced by the Task Manager.
It will reveal the "hanging" programs that have failed to close; ie. a word document with a save prompt still open.
http://errorfixer.co/windows-10-stuck-restart-screen-easy-fix/