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Then return to the tools menu and again reinstall OS X from scratch. You might consider re-partitioning and formatting your drive, but at least erase it in full.
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To do this, first ensure you have a full backup of your system, and then use Disk Utility in Recovery mode to erase your hard drive.
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Wipe and reinstall OS X if a basic reinstall does not work. Provided your hard drive is in working order, this should get it to boot again.
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On the other hand, reinstalling OS X should not overwrite your personal files at all, and only replace system software files. Granted you can restore from a recent backup, but not knowing the reason for the hangup at boot means any number of recent backups may contain the faulty configurations that are causing the problem. If Recovery Mode works, then consider reinstalling OS X using the tools presented to you. You can also access reputable troubleshooting resources to determine what exactly might be done for specific software errors. This can be done using official uninstallers that are distributed with programs, or by contacting developers for uninstall instructions. If Safe Mode works, uninstall recently added software or undo other recent changes that may have contributed to the problem. However, if you can access these modes without error, then you can perform any of the following approaches for fixing your system:
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If any of the above tests fail to work, then you likely have a hardware problem that cannot be overcome on your own, and it is time to schedule a repair for your Mac. If an error occurs, you will see a reference to it output on the screen however, if not then it will indicate no errors are found. This routine will load and run Apple’s tests and ensure all hardware on your system is running as expected. To boot to the Internet-based hardware tests, do the same but hold Option-D instead. To do this, reboot your system and hold the “D” down on your keyboard when you hear the boot chimes.
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If you cannot get your Mac to load in Recovery Mode, then it is time to test its hardware for any detectable errors. If you cannot mount your drive in Target Disk mode, or find it is slow to access, then this indicates a problem with your drive and you might need to have your Mac serviced. You can also manually back up any files you may need. By attaching your system to another Mac, the drive should mount and become available, where you can use Disk Utility to verify and repair the system. This mode only loads limited hardware components, so it is not a good way to test your Mac’s hardware however, it can be used to test your hard drive. Most Macs support a boot option called Target Disk mode, that allows your hard drive to be accessed as an external drive via Firewire or Thunderbolt.
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Provided you have an active Internet connection, your system should download the ~650MB recovery mode disk image from Apple and then boot to it. If for some reason standard Recovery Mode is not working, then next try restarting your mac and forcing it to load Internet Recovery by including the Option key along with Command-R. This drive’s contents cannot be tampered with under normal circumstances, so it should boot just fine if your Mac’s hardware is working properly. This will load your system’s built-in recovery disk that has a minimal version of OS X installed. Next, try booting your Mac to Recovery Mode by holding Command-R immediately when you hear the boot chimes at startup. If Safe Mode does not allow your system to boot, then the problem is deeper in the OS configuration and drive setup. Nevertheless, you can use it to get up and running, and be able to remove recently added software or make other configuration changes. Safe Mode will remove some caches and other temporary files, in addition to running a fix routine on your boot drive, which in themselves can sometimes fix the problem at hand however, Safe Mode mainly just bypasses problems and does not fix them.