Mac OS X 10.4, 10.5: Computer shuts down during Safe Boot

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When starting up with Safe Boot, a disk verification and repair happens automatically. In Mac OS X 10.4 or later, if the disk repair cannot repair issues on the disk, the computer will automatically shut down while a gray screen and Apple logo appear on the screen. This protects existing data on the drive. Even if you can start up without Safe Boot, you should address the disk issue as soon as possible.

You have three options if this happens:

  • Start from your Mac OS X Tiger Install DVD and use Disk Utility to try to repair the drive. If repair is successful, you should be able to start up normally. If repair is not successful, consider the next two options.

  • Back up your important data and files (as much as possible), then try using a third-party disk utility to repair the drive. Be sure that you use one that works with your version of Mac OS X. If this doesn't work, consider the next option.

  • Back up your important data and files (as much as possible), then perform an Erase and Install installation of Mac OS X on the affected volume. Important: This option completely erases the destination volume and then installs a new copy of Mac OS X. You should always backup important files on the target volume before performing an Erase and Install installation. You can then restore your backed up files afterwards.

Important: Information about products not manufactured by Apple is provided for information purposes only and does not constitute Apple's recommendation or endorsement. Please contact the vendor for additional information.

Published Date: Oct 7, 2016