If you are trying to install or update your macOS, you can also do the job in Safe Mode. Then, you can enter your password if necessary. You can see red Safe Mode on the upper right side of the screen. Release the Shift key when you see the login screen.

10 seconds later, you can press the Power button and press & hold the Shift key at the same time.Press the Power button for a while until it shuts down completely.Besides, it can fix some issues on your Mac machine. Your Mac computer can run in a pure environment without hardware failure or other startup issues after the machine boots into Safe Mode. Other names may be trademarks of their respective owners.Read More Method 2: Use Safe Mode to Solve the Issue The Android robot is reproduced or modified from work created and shared by Google and used according to terms described in the Creative Commons 3.0 Attribution License. Microsoft and the Window logo are trademarks of Microsoft Corporation in the U.S. Alexa and all related logos are trademarks of, Inc. App Store is a service mark of Apple Inc. Mac, iPhone, iPad, Apple and the Apple logo are trademarks of Apple Inc., registered in the U.S. Android, Google Chrome, Google Play and the Google Play logo are trademarks of Google, LLC. Firefox is a trademark of Mozilla Foundation.

or its affiliates in the United States and other countries.

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How to open a imac 27 late 2013