![]() ![]() ![]() Finally, you might have to reregister or reinstall some of your software. It’s not the end of the world, but it’s almost always inconvenient. That said, reinstalling OS X almost always corrects all but the most horrifying and malignant of problems. The process in El Capitan is (compared with root-canal work, income taxes, or previous versions of OS X) relatively painless. In theory, you should have to install El Capitan only once, or never if your Mac came with El Capitan preinstalled. If any essential OS X files become damaged or corrupted or are deleted or renamed If you replace your internal hard drive with a larger, faster, or solid state drive If you buy an external hard drive and want it to be capable of being your Mac’s startup disk (that is, a bootable disk) If you have a catastrophic hard-drive crash that requires you to initialize (format) or replace your boot drive If your Mac is currently running any version of OS X except El Capitan But you might find occasion to install, reinstall, or use it to upgrade, such as And in a perfect world, that would be the case. The following instructions do triple duty: Of course they’re what you do to install OS X for the first time on a Mac or a freshly formatted hard or solid-state disk. But they’re also what you do if something really bad happens to the copy of OS X that you boot your Mac from, or if the version of OS X on your Mac is earlier than 10.10 El Capitan. In other words, these instructions describe the process for installing, reinstalling, or upgrading OS X El Capitan. You must have Internet access to complete this procedure. If you’ve never had El Capitan on this Mac, the first thing to do is visit the Mac App Store, download El Capitan (it’s free), and install it. Once you’ve done that, here’s how to install, reinstall, or upgrade to El Capitan, step by step:īoot from your Recovery HD partition by restarting your Mac while holding down the Command+R keys. Select Reinstall OS X, and click Continue. The OS X El Capitan splash screen appears.Ī sheet informing you that your computer’s eligibility needs to be verified by Apple appears.Ĭlick Continue to begin the process of installing or reinstalling OS X. If you’re not connected to the Internet, you’ll be asked to choose a Wi-Fi network from the AirPort menu in the top-right corner. The El Capitan software license agreement screen appears. ![]()
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