If you can boot now, one of the devices you disconnected, or a combination of them, is causing the problem. Use a different keyboard and/or mouse, if those devices are wired. Disconnect all wired peripherals except those needed to boot, and remove all aftermarket expansion cards. Press and hold the power button until the power shuts off. Sometimes a boot failure can be resolved by resetting the NVRAM. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.Ĭ. Use the working Mac to copy the data to another drive. 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. Boot into the Recovery partition, or from a local Time Machine backup volume ( option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.”ī. You need an external hard drive to hold the backup data.Ī.
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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