Safe Mode For Mac

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What is safe mode?

Describes how to start your computer in Safe mode, which uses a minimal set of drivers and startup programs so that you can determine whether a background program is interfering with Office for Mac.

Safe Mode For Macbook

  • Our prior tutorials educated you on the ways to start up your Mac from a bootable media, pick a startup disk at boot time or after the fact, mount another Mac’s startup drive on your desktop in Target Disk Mode and boot your computer in Safe Mode or Verbose Mode. MacOS’ startup modes can be quite helpful for, among other things, troubleshooting complex issues that might require more than.
  • When you boot into Safe Mode, your Mac does a startup check-up, loads only essential kernel extensions and disable third-party startup fonts and options. It won’t load a single third-party startup option, drivers or programs. While Safe Mode restricts third-party features, this doesn’t necessarily prevent you from accessing important tools.
  • Jul 29, 2015  In Safe Mode, your Mac prevents some software, such as startup items, from loading. What does get loaded are the bare minimum level of drivers and essential software. This is by design, to help you troubleshoot your Mac and isolate the cause of a software conflict.

Safe mode (sometimes called safe boot) is a way to start up your Mac so that it performs certain checks and prevents some software from automatically loading or opening. Starting your Mac in safe mode does the following:

  • Verifies your startup disk and attempts to repair directory issues, if needed
  • Loads only required kernel extensions
  • Prevents startup items and login items from opening automatically
  • Disables user-installed fonts
  • Deletes font caches, kernel cache, and other system cache files

If your Mac has an issue that goes away when you start up in safe mode, you might be able to isolate the cause.

Start up in safe mode

To start up in safe mode:

  1. Start or restart your Mac, then immediately press and hold the Shift key. The Apple logo appears on your display. If you don't see the Apple logo, learn what to do.
  2. Release the Shift key when you see the login window. If your startup disk is encrypted with FileVault, you might be asked to log in twice: once to unlock the startup disk, and again to log in to the Finder.
Mac

To leave safe mode, restart your Mac without pressing any keys during startup.

If an issue doesn't happen in safe mode

If an issue doesn't happen when your Mac is started in safe mode, try restarting without pressing any keys.

Macbook Safe Mode

  • If the issue comes back, you might have incompatible login items.
  • If the issue doesn't come back, it was probably caused by a cache or directory issue with your startup disk, which safe mode fixed.

If your Mac restarts or shuts down in safe mode

Mac

Your Mac automatically checks the directory of your startup disk when you start up in safe mode. This is similar to what happens when you use Disk Utility to verify or repair your disk. If the directory is repaired, your Mac automatically restarts.

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If your Mac turns off, check the power connection at your Mac and the power outlet. If you're using a MagSafe power adapter, make sure the LED on your power adapter is yellow or green. Then start up in safe mode again.

If your Mac repeatedly restarts or shuts down while in safe mode, contact Apple Support or consult with an Apple Authorized Service Provider or Apple Store for help.

How to tell if your Mac is started in safe mode

If you're not sure that your Mac is started in safe mode, you can use System Information to check. The Software section of System Information lists Boot Mode as 'Safe' instead of 'Normal' when you're started in safe mode.

The login window also displays 'Safe Boot' in the upper-right corner of the screen when your Mac is in safe mode.

Some features aren't available in safe mode

Some features of your Mac aren't available when it's started in safe mode:

  • You can't play movies in DVD Player.
  • You can't capture video in iMovie and some other video apps.
  • Some audio input or output devices might not work.
  • Some USB, FireWire, and Thunderbolt devices might not be available.
  • Wi-Fi networking might be limited or unavailable, depending on the Mac and macOS version you're using.
  • Accessibility features like VoiceOver might not work as expected.
  • File sharing is disabled.

Safe mode in OS X Leopard v10.5 or later also disables accelerated graphics. This makes the menu bar appear solid even if 'Translucent Menu Bar' or 'Reduce Transparency' is selected in System Preferences. Your screen might also 'blink' or 'tear' during login when your Mac is started in safe mode.

If your Mac doesn't have a keyboard to start up in safe mode or if you can't use the Shift key

If your Mac doesn't have a keyboard available to start in safe mode, but you have remote access to your Mac, you can configure the Mac to start up in safe mode using the command line.

  1. Access the command line by opening Terminal remotely, or logging into the computer using SSH.
  2. Use the following Terminal command:
    sudo nvram boot-args='-x'
    If you want to start in verbose mode as well, use this instead:
    sudo nvram boot-args='-x -v'
  3. After using safe mode, use this Terminal command to return to a normal startup:
    sudo nvram boot-args='