Release the Command + R key combination once you see the Apple logo on display.Restart your Mac, or power it on, while holding down the Command + R key combination.Reinstall Your Mac’s OS Without an Installation Disc Select Disk Utility and erase your HD, just as instructed to do in the first section of this article. From there, you’ll see an OS X Utilities window with the aforementioned options listed. Restart your Mac and hold down the Command + R keys until the Apple logo appears. Does reinstalling macOS delete everything? How do I restore my Mac OS X Lion to factory settings?.How do I restore factory settings on my MacBook air?.How do I reinstall OSX without recovery mode?.How do I reinstall OSX without Internet?.Can I reinstall macOS without Apple ID?.How do I factory reset my iMac g4 without CD?.How do I restore my old MacBook to factory settings?.How do I uninstall and reinstall OS X Lion?.How do I reinstall OS X Lion from recovery partition?.How do I reinstall OS X Lion without CD?.How do I restore my Mac OS X Lion to factory settings?.Once you have backed up all your data, you can try a few fixes to your “unmountable” hard drive problems. You can now start backing up your data using the external drive.Choose Disk Utility and hit Continue to proceed.The macOS Utilities window will now appear.After hearing the startup sound, press the CMD and R keys.Get an external hard drive and connect it to your Mac.Click the partition on which your operating system is installed - in this case it's called Mac OS X - and, under the First Aid tab, click Repair Disk Permissions. If your Mac is using a firmware password, you're prompted to enter the password.
Option (⌥) or Alt: Start up to Startup Manager, which allows you to choose other available startup disks or volumes. Reboot the Mac and hold down Command+R to boot into Recovery, or hold down OPTION Select “Recovery HD” at the boot menu At the Mac OS X Utilities screen, select “Disk Utility” Select the boot volume or partition from the left menu and click on the “Repair” tab.
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