Sounds like a possible HDD gone bad. Try running a ePSA and see if any error codes come up: ePSA test 
My pc started running slow then I restarted then is we’re problems started after I set drive back on my gpu now I get loading screen with alien head and f12 or f2 option in it then it ever starts repair and the spinning circle stops spinning like it’s stuck so I have to turn of pc and restart it .then sometimes it just freezes on alien head screen and keyboard doesn’t even come on to press f2 or f12  and sometimes it will start windows and I get blue screen which says at bottom inaccessible boot device then starts it. Automatic repair and freezes 
Aurora R3, inaccessible boot device