If you can boot and log in now, empty the Trash, and then open the Finder Info window on your boot volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, your boot volume is damaged and the drive is probably malfunctioning. When you boot in safe mode, it's normal to see a dark gray progress bar on a light gray background. If you’ve forgotten the password, you will need to reset it before you begin. You must know your login password in order to log in. The login screen appears even if you usually log in automatically. Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. If you've booted from an external storage device, make sure that your internal boot volume is selected in the Startup Disk pane of System Preferences.īoot in safe mode. Finding out which one is a process of elimination. 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. 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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