Whenever i start my pc an i login my screen goes black (its still on)? Im currently running a test copy of windows 10 home.
I have a r9 390x
I5 4960k @ 3.4ghz
does taskbar show up? What happens if you hit ctrl alt del? what happens if you restart PC?
try disconnecting all extra USB devices or speakers or extra monitors, and restart and see if its any different - it could be the device isn't answering windows in time and explorer just hangs.