Solutions if Windows 8 or 8.1 show a Black Screen of Death or only a blinking cursor. After boot, updating or upgrading or while you are using it.
Command to disable Fast Startup:
REG ADD "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Power" /V HiberbootEnabled /T REG_dWORD /D 0 /F
15 май 2017