Generally, since the directory check occurs during the gray startup screen, you can reboot immediately after logging in. To return to a normal boot, simply restart the computer without holding any keys. While a Safe Boot can be helpful for troubleshooting, many services will be unavailable - specifically audio and network devices. In Mac OS 10.4 or later, you will have to login to your account, even if it normally does so automatically.Note: Startup will likely take substantially longer than normal.Once the gray Apple and progress indicator appear, release the Shift key.Immediately after the startup chime, press and hold the Shift key.
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: 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.
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