Download the relevant macOS or OS X installer from Apple, then use Terminal to create a USB installer you can boot up from. Or use the OS X installation disc that came with your machine — or buy a new one — to boot up and install OS X on your Mac's hard drive.
Reinstall from macOS Recovery
- Reinstall Mac OS X Mountain Lion before selling a Mac. Cannot reinstall OSX Mac mini 6,1. Rescuing a MacBook Pro 13-inch, Mid 2009. Reinstall OS X (Yosemite.
- When you're ready to reinstall macOS, choose Reinstall macOS from the Utilities window. Then click Continue and follow the on-screen instructions. You will be asked to choose a disk on which to install. If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
- Install older OS X onto an external drive Start your Mac holding down Command + R. Prepare a clean external drive (at least 10 GB of storage). Within OS X Utilities, choose Reinstall OS X. Select external drive as a source. Enter your Apple ID.
- The OS X Utilities window appears. Select Reinstall OS X, and click Continue. The OS X Yosemite splash screen appears. A sheet appears informing you that your computer's eligibility needs to be verified by Apple. Click Continue to begin the process of installing or reinstalling OS X.
Start up from macOS Recovery
The Recovery installs different versions of macOS depending on the key combination you press while starting up. Hold down one of the following combinations immediately after pressing the power button to turn on your Mac. Release when you see the Apple logo or a spinning globe.
| Command (⌘)-R | Install the latest macOS that was installed on your Mac, without upgrading to a later version. |
| Option-Command-R | Upgrade to the latest macOS that is compatible with your Mac. |
| Shift-Option-Command-R Requires macOS Sierra or later | Install the macOS that came with your Mac, or the version closest to it that is still available. This combination requires macOS Sierra or later. |
When you see the macOS Utilities window, continue to the next section to determine whether to erase your machines hard drive or begin installing macOS.
Erasing your startup disk
Decide whether to erase (format) your startup disk before installing macOS. You should erase your startup disk in the following circumstances.
- You're trying to resolve an issue that Disk Utility cannot repair.
- The macOS installer says that it can't install on your computer or volume.
- You need to give the Mac back to HardSoft.
- You need to give the Mac to another colleague and it needs to be clean from old data.
- On a rare occasion your Mac may have a virus or a piece of Malware.
Erasing your startup disk permanently deletes all of the data stored on it.
Online video editing software effects. If you need to erase your startup disk, follow these steps.
- Select Disk Utility from the utilities window of macOS Recovery, then click Continue.
- Select your device or volume in the sidebar of Disk Utility.
- Click the Erase button or tab.
- Click Erase to begin erasing your disk.
- When done, quit Disk Utility to return to the utilities window. You're now ready to install macOS.
Install macOS
Follow these steps after starting up into the recovery agent: Tai game mien phi cho macbook.
- Choose Reinstall macOS (or Reinstall OS X) from the utilities window.
- Click Continue, then follow the onscreen instructions. You'll be asked to select your disk. If you don't see it, click Show All Disks.
To verify eligibility to install macOS, your Mac serial number is sent to Apple, and you might be asked for your Apple ID. - Click Install. Your Mac restarts after installation is complete.
If you erased your disk before installing, or you installed on an external drive or other new disk, your Mac restarts to a setup assistant. Macbook pro 2016 function keys.
- If you're keeping your Mac, complete the setup assistant with your own information.
Reinstall Mac Os X From Cd
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