Wait until you see the macOS Utilities (or OS X Utilities) window. Release the keys until you see the boot screen. ![]() If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Press and hold the Command + R (or Command + Option + R) before the Mac starts to boot. ![]() How to use and troubleshoot FireWire target disk modeģ. The internal drive of the machine running in target mode will mount as an external drive on the other machine. Connect the two Macs with a FireWire cable. If you have a working Mac, and both it and the non-working Mac have FireWire ports, boot the non-working Mac in target disk mode by holding down the key combination command-T at the startup chime. When your Mac has shut down completely, press and hold the power button until 'Loading startup options' appears on the screen. ![]() ![]() Boot from your recovery partition (10.7 or later), a local Time Machine backup volume (10.7.2 or later), or your installation disc (10.6.8 or earlier.) 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.”Ģ. You need an external hard drive to hold the backup data.ġ. There are several ways to back up a Mac that is unable to fully boot.
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