Chances are you have a failing hard drive -- run a full diagnostic on the drive (F12 at powerup).  If the drive returns an error such as 2000-0142, it needs to be replaced.  
  Hello Sir/Ma'am I Have Windows 10 Laptop Dell Inspiron 15 3567 My Device Is Not Going Till Password Screen.When I Turn On My Laptop It Shows Preparing Automatic Repair.Then Diagnosing Your PC And Your PC Did Not Start Correctly And When I Choose Startup Repair Then I Type My Recovery Key Then It Shows Startup Repair Couldn't Fix Your PC Safe Mode Is Also Not Opening,When I Press Safe Mode.So Can You Please Tell Me What To Do Now?
Dell Inspiron 15 3567 Laptop Not Going Till Password Screen