Cannot Reinstall Os X Yosemite

Start up from macOS Recovery

• Os X Yosemite Installer
• Reinstall Os X Yosemite
• Install Mac Os Yosemite

There are a few reasons why you might want to reinstall macOS (or even Mac OS X). Perhaps your Mac is working erratically and you think that a clean install of the operating system might fix the. BTW Aside from the possible legal issues involved in your acquisition of OS X in the manner you described, you leave yourself open to all sorts of security issues downloading OS X other then legitimately via the App Store or having Apple install it. – user3439894 Jul 24 '16 at 14:23. I bought a used iMac and when I turn it on I am shown the OS X Utilities screen. I would like to install the operating system but I cannot do so. I have tried everything suggested on other questions on this topic: Factory reset; I.e. Formatting the hard drive (as instructed by Apple) and restarting. You are thinking about selling your Mac or simply need to install OS X Yosemite follow the tutorial to easy get it done, this will erase all your information. Easiest fix is to reinstall OS X (and Yosemite will certainly work on your MBPro, which will support El Capitan, should you want to update to that) If you know the previous owner, they would have.

Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

• Apple silicon: Turn on your Mac and continue to press and hold the power button until you see the startup options window, which includes a gear icon labeled Options. Select Options, then click Continue.
• Intel processor: Make sure that your Mac has a connection to the internet. Then turn on your Mac and immediately press and hold Command (⌘)-R until you see an Apple logo or other image.

Os X Yosemite Installer

If you're asked to select a user you know the password for, select the user, click Next, then enter their administrator password.

Reinstall macOS

Select Reinstall macOS from the utilities window in macOS Recovery, then click Continue and follow the installer's instructions.

Follow these guidelines during installation: Upgrade imac 2011 to high sierra.

• Allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.
• If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
• If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first.
• If the installer is for a different version of macOS than you expected, learn about other installation options, below.
• If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.

After installation is complete, your Mac might restart to a setup assistant. If you're selling, trading in, or giving away your Mac, press Command-Q to quit the assistant without completing setup. Then click Shut Down. When the new owner starts up the Mac, they can use their own information to complete setup.

Other macOS installation options

By default, macOS Recovery installs the latest macOS that was previously installed on your Mac.* You can get other macOS versions using one of these methods:

• On an Intel-based Mac, you can use Option-Command-R at startup to upgrade to the latest macOS that is compatible with your Mac. Exceptions:
  • If macOS Sierra 10.12.4 or later was never previously installed, you will receive the macOS that came with your Mac, or the closest version still available.
  • If your Mac has the Apple T2 Security Chip and you never installed a macOS update, you will receive the latest macOS that was installed on your Mac.
• On an Intel-based Mac that previously used macOS Sierra 10.12.4 or later, you can use Shift-Option-Command-R at startup to install the macOS that came with your Mac, or the closest version still available.
• Reinstall macOS from the App Store instead of using macOS Recovery. If you can't install the latest macOS, you might be able to install an earlier macOS.
• Create a bootable installer, then use it to install macOS on your Mac or another Mac.

* If you just had your Mac logic board replaced during a repair, macOS Recovery might offer only the latest macOS compatible with your Mac. If you erased your entire disk instead of just the startup volume on that disk, macOS Recovery might offer only the macOS that came with your Mac, or the closest version still available.

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• Reinstalling Yosemite on a computer alreadyrunning it

Upgrading from previous versions to OS X 10.10 (Yosemite)

OS X 10.10 (Yosemite) is no longer available for purchase from theMac App Store. If you have a previous version of the operating system,and your computer meets the system requirementsfor OS X 10.11 (El Capitan), you can upgrade directly to thatversion instead; see ARCHIVED: Install or upgrade OS X 10.11 (El Capitan)

Reinstalling Yosemite on a computer already running it

Reinstalling while keeping files, applications, and settings

Reinstall Os X Yosemite

1. Restart your computer, and immediately hold down command-r until the gray Apple logo appears.
2. If prompted, select your main language and then click the arrow.
3. Click Reinstall OS X, and then Continue. Follow the instructions on the screen, and then choose your hard disk. Click Install, and enter your Apple ID information if prompted.
4. When the installation is complete, select App Store.. from the Apple menu, and install any available updates.

Reinstalling while erasing everything on your computer

Install Mac Os Yosemite

1. Restart your computer, and immediately hold down command-r until the gray Apple logo appears.

2. If you see a screen asking you to select your main language,choose it, and then click the arrow.
3. Click Disk Utility, and then Continue.
4. In Disk Utility:
   1. Click your hard disk in the left column, and thenclick the Erase tab.
   2. Next to 'Format:', make sure Mac OS Extended (Journaled)is selected. In the 'Name:' field, give your disk a name.
   3. If you would like to securely erase your data, click SecurityOptions.., adjust the slider accordingly, and clickOK.
   4. When you're ready, click Erase.., and thenErase again to erase your disk.
   5. Once it's completed, quit Disk Utility.
5. Click Reinstall OS X, and then Continue:
   1. Follow the instructions on the screen, and then choose your harddisk.
   2. Click Install. If prompted, enter your Apple IDinformation.
   3. Once the installation is complete, you'll beasked to enter basic information, and have the option to transfer datafrom another computer or backup.
6. From the Apple menu, select App Store, and then installany available updates.