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How to Boot in Safe Mode on Mac OS

Abdelrahman Reda by Abdelrahman Reda
August 29, 2018
in Apple
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RECOMMENDED: Improve PC performance Migrate to Solid State Drive (SSD)

Safe mode can be used as a tool to troubleshoot problems that might prevent the Mac from starting fully or to identify other problems associated with the boot disk.

Safe mode (sometimes called “booting in safe mode“) is a way to start the Mac PC, which performs certain checks, and prevents the automatic loading and opening of certain programs.

When you start your Mac in safe mode, the following happens.

  • The startup disk is checked and, if necessary, attempts are made to resolve directory errors.
  • Loads only required kernel extensions.
  • Prevent automatic opening of startup and logon objects.
  • Disables fonts installed by the user.
  • Removes font caches, kernel cache, and other system cache files.

Starting the computer in safe mode.

Start or restart the Mac, then immediately press and hold the Shift key. The Apple logo appears on the display.

When the login window appears, release the Shift key. If the boot disk is encrypted using FileVault, you may have to enter credentials twice: to unlock the boot disk and to enter the Finder.

To exit the safe mode, restart the computer without pressing any keys during the startup.

How to determine if the computer is running in safe mode

If you doubt that your Mac is running in safe mode, you can check it using the System Information utility. After starting in safe mode in the Software section of the System Information window, the boot mode will indicate Safe, instead of Normal

In addition, if the Mac is launched in safe mode, Safe Boot appears in the upper right corner of the screen.

Some features are not available in safe mode:

  • You can’t play movies in DVD Player.
  • capture video in iMovie and some other video apps.
  • Some audio input and output devices may not work.
  • Some USB, FireWire, and Thunderbolt devices might not be available.
  • Depending on the Mac model and the OS version of macOS, access to a wireless Wi-Fi network may be limited or unavailable.
  • Accessibility features like VoiceOver might not work as expected.
  • File sharing is disabled.

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Abdelrahman Reda

Abdelrahman Reda

Abdelrahman Reda is a Motivated Support Engineer with 6+ years of corporate and consumer support experience. His experience related to administration of Network, NOC support, computers and anti-virus server, data entry, networking sites, remote support.

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