This makes booting your Mac a simple and pleasant experience, but can also hamper troubleshooting efforts. But instead of finishing the boot and bringing you to the default macOS login GUI, it gives you a text terminal that can be used for everything from advanced troubleshooting to hard drive repair. But instead of taking place at the beginning of startup, you enter it after booting your Mac in Safe Mode.
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To get started, boot your Mac in Safe Mode by holding down the Shift key at startup. Log in to your Mac normally, and you should see the macOS Utilities app open. Select Disk Utility and press Continue. Enter your admin password when prompted.
Sometimes this can get out of sync with the actual files on disk. Cache files are temporary holding places for constantly changing information, such as installed fonts, graphics from web pages, Spotlight indexing, etc. As above, program errors and crashes can corrupt cache files, making them fully or partially unreadable. This, in turn, causes individual programs or the OS itself to misbehave. There are a number of utilities on the market to help with these problems, but a very simple solution is built right into your Mac: the Safe Boot.
Among other things, a Safe Boot runs a full scan on the hard drive sector by sector and fixes problems found in the disk directory. It also clears cache files of old data, so you get a clean start on your next reboot. To perform a Safe Boot, restart the computer and hold down the Shift key until you reach the desktop. This may take a few minutes, and depending on your OS X version you may see a progress bar onscreen for part of the process.
For more advanced disk directory repairs, I highly recommend DiskWarrior.
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One common step people take to try and solve disk problems is to repair permissions using Disk Utility. Back in the early days of Mac OS X this was helpful, but it has become much less necessary in current versions. When your Mac starts up, programs you use frequently can be set to automatically launch at startup: Safari, Mail, Dropbox, etc. And some programs may have configured themselves to launch at startup whether you want them or not — Skype, anyone?
You may have extraneous items or out-of-date tasks vying for attention.
Use any of these 3 methods to get your Mac up and running
Some of these items may no longer be needed or current. For example, if you used to run Symantec AntiVirus on your iMac in and have just migrated things along ever since, there may be one or two Symantec programs still set to launch at startup. A long delay at startup could be a sign of a missing shared network drive. The next few steps are a bit more advanced.
What to do when a Mac won't boot to Safe Mode
You need to be familiar with locating and deleting configuration files on your hard drive. If you are not comfortable with these steps, skip down to the section on RAM. These folders contain. An Administrator password will be required. Not all of these folders may exist on your system.
Note that in OS X Internet plug-ins can also cause problems, especially older plug-ins with newer web browsers. Plug-ins tend to get installed automatically as you visit websites over the years, but rarely get uninstalled. When First Aid is finished, restart your Mac normally. You should use this startup mode only for troubleshooting and not for running day-to-day applications.
Press return or enter after you type the above line. Fsck will start and display status messages about your startup disk. When it finally finishes this can take a while , you will see one of two messages.
7 Mac Startup Options Every OS X User Should Know
The first indicates that no problems were found. The second message indicates that problems were encountered and fsck attempted to correct the errors on your hard drive. If you see the second message, you should repeat the fsck command again. Share Pin Email.
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