How To Recover Your Mac And What To Do If Recovery Fails
Mac OS X Recovery Options If you are unable to start your Mac successfully and not get to the login screen or even load the Finder, the first option is to turn to your recovery utilities that are built-in. To do so, shut down your Mac then start it, immediately before the Apple logo appears on screen, press Command + R keys. Exercise a little patience here as the recovery options seem to load a mini copy of OS X so it will take a little while....