In the window that opens, select the Software category in the left-hand sidebar. In the central area, you should see Boot mode: Safe. Safe mode tested and repaired if applicable the startup drive. The issue could have been a drive in poor health. You may want to make sure you have a backup strategy in place. Safe mode also disabled all your startup and login items. If, when you restart your Mac using the normal boot process, the problem returns, it could be a corrupt, out-of-date, or conflicting login or startup item.
Font issues are usually limited to specific apps, so when you return to the normal boot up process, be sure to try the app that was giving you problems. System, kernel, and font caches were deleted. Any one of these cache files could have been corrupt, or contained out-of-date information that could have caused the issue you were having. In order to complete the repair, your Mac is automatically restarted.
How to Boot in Single User Mode on a Mac
You may want to restart your Mac once again in safe mode to ensure no further drive repairs need to be performed. Exiting Safe Mode To exit safe mode, simply restart your Mac without holding down any keyboard shortcuts. If you used Terminal to set boot args, see the Terminal section, below, for instructions on how to reset the boot args.
Single-User Mode Single-user mode is a minimal UNIX environment with no graphical shell, only the bare minimum of system daemons running, and a basic console to support a command line. The name single-user is a reference to the normal UNIX multi-user environment, and the need to occasionally force a multi-user system into single-user mode to perform maintenance tasks that require exclusive access to normally shared resources. Even in this minimalist environment, there are quite a few UNIX commands available that allow you to perform basic repairs to the startup drive, mount the storage drives, read and write files, and start various system daemons.
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Once the single-user console is available, you can enter many common UNIX commands. Single-user mode can be used for many different functions, including repairing a drive or ejecting stuck media in a drive. Continue to hold down the two keys until you see white text on the display. You can repair a drive by using the fsck command.
Fsck stands for File System Check the name is sometimes referred to as F ile S ystem C onsistency Chec K ; it can be used with various optional parameters. Note : You should only use fsck as a last resort to gain access to a drive having problems. Fsck will run through various phases of checking the startup drive. This means fsck found and repaired one or more problems. Because there can be additional issues after a repair is made, you should rerun fsck until you see the message:. If an issue doesn't happen when your Mac is started in safe mode, try restarting without pressing any keys.
Your Mac automatically checks the directory of your startup disk when you start up in safe mode. If the directory is repaired, your Mac automatically restarts. Then start up in safe mode again.
Safe Mode & Single-User Mode: What They Are, How to Use Them
The login window also displays "Safe Boot" in the upper-right corner of the screen when your Mac is in safe mode. Safe mode in OS X Leopard v Your screen might also "blink" or "tear" during login when your Mac is started in safe mode.
Use safe mode to isolate issues with your Mac You can use safe mode to help resolve issues that might keep your Mac from completely starting up, or to isolate other issues related to your startup disk. What is safe mode?
How to use, troubleshoot, and repair your Mac
Start up in safe mode To start up in safe mode: Start or restart your Mac, then immediately press and hold the Shift key. All Rights Reserved. Reproduction without explicit permission is prohibited. Damon says:. October 30, at am.
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