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.10.4 or later: Disables all startup and login itemsĪ Safe Boot can potentially repair problems that prevent Mac OS X from starting properly.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: When the new owner starts up the Mac, they can use their own information to complete setup.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. If you're selling, trading in, or giving away your Mac, press Command-Q to quit the assistant without completing setup. Your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.Īfter installation is complete, your Mac might restart to a setup assistant. Allow installation to complete without putting your Mac to sleep or closing its lid.If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first.If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
To begin installation, select Reinstall macOS from the utilities window in macOS Recovery, then click Continue and follow the onscreen instructions.įollow these guidelines during installation: Reinstalling macOS does not remove data from your Mac.
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