![]() ![]() If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode by holding down the key combination command-T at the startup chime. When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in the support article linked below, under “Instructions for backing up to an external hard disk via Disk Utility.”ī. Boot into Recovery by holding down the key combination command-R at the startup chime, or from a local Time Machine backup volume ( option key at startup.) Release the keys when you see a gray screen with a spinning dial. You need an external hard drive to hold the backup data.a. There are several ways to back up a Mac that is unable to boot. If you don't care about the data that has changed since your last backup, you can skip this step. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. The first step in dealing with a boot failure is to secure your data. ![]()
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