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Should your computer boot properly, try restarting and booting as normal. You can then restart into Safe mode, remove the problem extension, and try again.
Every Mac ships with Recovery mode, which lives on a separate partition on the startup disk. Later you also may want to restore it. Here's how to do both. Keep in mind this requires an internet connection and will take a lot longer, since macOS needs to download the image first.
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Select it from the list on the left, then click First Aid followed by Run. File system consistency check or fsck for short is a longstanding Unix tool for checking and fixing drive problems. Depending on the size of your volume, the type of drive you have installed, and the potential problem, fsck can take a while to complete.
Patience and persistence is important if you want to fix your drive this way. Gonna be a bad weekend, as this is not what a Mac is supposed to look like during boot.
This boot mode allows you to make changes to shared user resources. You can type fsck -fy to run fsck. If you have a firmware password set on your Mac, Single User mode is not available to you.
Troubleshoot Your Mac With These Hidden Startup Options
If you interrupt the process while it is making changes to your drive, you may incur data loss. Read More. It's called Apple Service Diagnostic, and we'll show you how to get it and use it for best results.
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Read More to learn as much information about the problem as you can. To boot from a specific device, press and hold the Option key while booting your Mac. From here, you can choose to boot from different connected hard drives, USB flash drives, network locations, and other boot devices. To boot directly from the network with Netbook, press and hold N instead.
To access this tool, press and hold the D key while booting your Mac. Select your language and your Mac will automatically test its hardware and inform you if anything is wrong. Macs offer a Safe Mode, also known as Safe Boot. When you boot in Safe Mode, your Mac will check its startup volume, only load necessary kernel extensions, and disable third-party fonts and startup options.
To load your Mac in Safe Mode, press and hold the Shift key while it boots.
You can stop holding the Shift key when you see an Apple logo and progress bar. Of course you can boot into Safe Mode by holding down the Shift key at boot: that does an fsck, clears cache files, among other tasks. Like Liked by 1 person. Is there any difference in repair between rebooting or cold booting in safe mode until the login screen shows and then rebooting normally versus booting in safe mode until the login screen shows and then entering username and password to login in safe mode and then rebooting normally?
Finally, is there any difference in repair or housekeeping-maintenance, etc between rebooting the Mac versus shutting it down and then cold booting?
In other words, is it better to shut down and cold boot instead of reboot in some circumstance to troubleshoot some Mac issue? Safe Mode does not, to the best of my knowledge, perform a thorough fsck at all, or repair anything beyond the most minor of errors. First Aid in Disk Utility does a full fsck , including checks of all snapshots, and takes far longer than a Safe Mode startup. For some procedures, notably entering Diagnostic Mode, Apple recommends starting up after a shutdown rather than a restart.
Posts Tagged ‘reset mac password single user mode’
Not by a long way. Thank you. You are absolutely correct, at least in TL;DR it runs a full fsck which is utterly useless! Many thanks! It would be great if you could write a book or similar with all these tricks and tips! The big problem is keeping it up to date, which is why a blog is so much easier to do, and to keep reasonably accurate. I did once start writing a commissioned book on Mac OS X Server, and before I could even complete my outline, everything had changed from when I started. You are right.