Stuck at /*AppleKeyStore starting (built: Jun 23 2016 18:53:27)*/

[iMacs]

Additional information: the proccess bar under apple logo at boot sequence STARTS at 70~80% and(after running nvram -c in unibeast usb, loading starts from 0%) got stuck. Any help would be graceful... since it's my main computer with no windows.

 

[iMacs]

After waiting few days for an answer, I assumed my OS has been corrupted by recent force_shutdown.
Does this make sense?