Click the icon for your boot hard drive at the left of the Disk Utility window. Ultimately, First Aid tells you you hope that the drive has been repaired and is now okay. If so, go back to work. Booting your Mac in Safe Mode may help you resolve your startup issue by not loading nonessential and non—OS X software at boot time.
You do it by holding down the Shift key during startup. If you do log in to your Mac, type your password as usual, but before clicking the Log In button, press the Shift key again and hold it until the Finder loads completely. Taken together, these changes often work around issues caused by software or directory damage on the startup volume.
Solved: The volume Macintosh HD was found corrupt and needs to be repaired
They keep track of things such as. You might see the spinning-disc cursor for a minute or two while your Mac thinks about it — then the icon disappears, and your Mac chimes again and restarts. DIY Entertainment. Ignore the gut-wrenching feeling that fixing your computer will take a long time. Save yourself time and money by trying to fix it yourself. If you regularly back up with Time Machine , you have little to lose.
OS X Mavericks For Dummies
These tips are for instances where your Mac refuses to boot. You might see a black screen, you could get an error message, or your computer may hang on the white Apple logo.
If your machine is running fine, this troubleshooting guide is not for you. You can, however, run First Aid on your drive anytime in macOS. Click on First Aid followed by Run to scan the disk for problems and attempt to fix them.
By attempting to boot into Safe mode, macOS will scan and repair any errors it finds on the disk. Safe mode boots your operating system with only the bare minimum it needs to run. No third party kernel extensions will boot, login items are skipped, and it empties certain caches.
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To boot into Safe mode: Turn your computer off, then press and hold the Shift key while your computer boots. If your computer has hung on boot, shut it down by holding the power button until the machine switches off around 10 seconds first.
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.
OS X Mavericks: How and why to Repair 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. 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.
What You Need To Know About the Mac Disk Utility
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.
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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.