When finished, quit Disk Utility and choose the option to restore your system from a Time Machine backup. Now select "Mac OS X Extended (Journaled)" as the format to use and click the Erase button. Use this to select your boot volume (in the Disk Utility sidebar) and then choose the "Erase" tab. This can be done by booting to the Recovery HD partition (hold Command-R immediately after hearing the boot chimes), and then choose Disk Utility at the OS X tools window. Alternatively, you will need to re-format your hard drive. The first is to use a third-party filesystem checking and repair program such as DiskWarrior, to hopefully fix the problem. If this happens, then you have two options. While rare, there may be corruption in the formatting that either cannot be detected by Disk Utility or will not be properly repaired, and which can result in the system stalling when performing the "fsck" disk checking routine during the Safe Mode startup. Unfortunately this may take a while to do, but it can be re-enabled in the future if desired.Ī final issue with loading Safe Mode may be with faults in the filesystem's formatting. Therefore, if you cannot boot to Safe Mode, try disabling disk encryption. This breaks the ability of the hardware to store boot arguments and then pass them to the kernel, which helps secure the system by ensuring that security services are always run, and full-access modes like single-user mode cannot be loaded.
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