IMPORTANT: Reinstalling the OS will erase all data on your hard drive.Due to the size of the operating system this process can take several hours.
However, to fully reinstall Lion you must be connected to the internet because the operating system files and data have to be downloaded.
10.3.9 or earlier: Disables all non-Apple startup items.Load only the required kernel extensions.Force a directory check of the startup volume (as Disk Utility's Disk Repair).This can help to troubleshoot startup problems when an OS installation disc is not available.Ī Safe Boot will perform the following tasks:
#BOOT INTO RECOVERY MAC OS X 10.13.6 HOW TO#
This document explains how to perform a Safe Boot in Mac OS X 10.2 or later and how to boot into the recovery partition for OS X Lion.