Before We Begin

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Print this page so you can refer to it later. After your Mac restarts some Mac computers play a startup sound , press and hold the Command and R keys until the Apple logo appears, then release the keys.

How to Repair a Mac Disk with fsck from Single User Mode

Click the First Aid button. If Disk Utility tells you the disk is about to fail, back up your data and replace the disk. Otherwise, continue to the next step.


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  • Use “First Aid” in the Disk Utility;
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You can click Show Details to see more information about the repairs. Otherwise, you may need to do one of the following. You need to check each file in the list of affected files.

Resolve Startup Problems on a Mac with Disk Utility

Installation receipts are used as a reference for file permission repairs. Do not let go of the Shift key until your screen says Safe Boot.

Repairing Your Mac Hard Drive in Disk Utility

Once you see the screen with the words Safe Boot let go of the Shift key. If you need to login, login.

How to repair disk errors in Recovery Mode

Open Disk Utility located in the Utility folder of your Applications folder, it'll be down at the bottom. Select Repair Disk Permissions. When Disk Utility has done its job you'll see the words "Permissions repair complete". Once the utility program has run through the operating system you can quit the application and restart the computer.


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  2. 1. Try Safe Mode!
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  6. Regardless of what application you are using unless there is a known bug in the application Repairing Disk Permissions in Safe Boot will take care of many problems.