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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. 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.
If the directory is repaired, your Mac automatically restarts. 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. 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. 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.
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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 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. Access the command line by opening Terminal remotely, or logging into the computer using SSH.
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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'. After using safe mode, use this Terminal command to return to a normal startup: sudo nvram boot-args='.