OS X Mountain Lion: Start up in safe mode
This article has been archived and is no longer updated by Apple.
Start up in safe mode
Starting up in “safe mode” may help you diagnose problems you’re having with your Mac.
Note: To print these instructions, open the Help Viewer’s Action pop-up menu (looks like a gear) and choose Print.
- Shut down your Mac and wait 10 seconds.
- Press the power button.
- Immediately after you hear the startup tone, hold down the Shift key.
You should press the Shift key as soon as possible after you hear the startup tone, but not before.
- Release the Shift key when you see the gray Apple logo and progress indicator (spinning gear).
To leave safe mode, restart the computer normally without holding down any keys during startup.
Last Modified: Nov 11, 2015
One Moment Please
Thanks for your feedback.
46% of people found this helpful.
Additional Product Support Information