If your Mac is freezing, not starting up correctly, or behaving in another odd way, you could be looking at several possible causes. For example, a hardware failure, software glitch, or corrupt file might be to blame. To help narrow down the possibilities and perhaps just gain access to your files again, Safe Mode is a good place to start.
Safe Booting Mac OS X disables many of the nonessential services and extensions that usually start up when a Mac is turned on. As a result, only the bare minimum components required to start the system are loaded. This lessens the chances that extraneous (and possibly corrupt) files will affect the process. Starting up in Safe Mode also does a directory check of the startup disk, disables non-system fonts, turns off hardware accelerated graphics, stops file sharing, and clears cache files that could be the root of your problems. These caches might be responsible for rare blue screens after certain software updates.
To start your Mac in Safe Mode, follow these easy steps:
Continue holding the Shift key until a gray progress indicator is displayed on the screen. After a couple minutes the system should bring you to a login screen that clearly states “Safe Boot”. Log in with your username and password.
While you’re in Safe Mode, you shouldn’t notice too much of visual difference from the way your Mac normally looks. Some features and programs won’t work, though, since certain parts of the system have been disabled. Use the computer in Safe Mode as needed to determine the cause of your issues and access your files. When you’d like to return to Normal Mode, just restart your Mac like you usually would – without holding down Shift.
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