It is fully safe, as OnyX has proven to be worthy of your trust. The application does a great job of guiding a user through the initial installation process which is a big plus. While OnyX comes with an extremely high learning curve it is definitely worth it if you are serious about Mac maintenance. Safe Mode is a troubleshooting step best suited if you’ve noticed that right after a new software installation or update, your Mac will no longer boot. Safe Mode boots OS X with the bare minimum - no additional software or extensions. Safe Mode always takes a long time to boot.
![]() ![]() What is safe mode?
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:
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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:
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.
If your Mac restarts or shuts down in safe mode
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.
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:
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.
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AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
February 2023
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