- Step 4: Reinstall a clean Mac operating system. Restart your Mac. While the startup disc is waking up, hold down the Command+R keys simultaneously. Click on Reinstall macOS (or Reinstall OS X where applicable) to reinstall the operating system that came with your Mac. Click on Continue.
- The maximum version of Mac OS X, OS X, or macOS supported by each G3 and later Mac follows. For complete specs on a particular system, click the name of the Mac. For all Macs that are compatible with a specifc maximum supported version of Mac OS X - courtesy of EveryMac.com's Ultimate Mac Sort - click the OS of interest.
Reinstall from macOS Recovery
macOS Recovery makes it easy to reinstall the Mac operating system, even if you need to erase your startup disk first. All you need is a connection to the Internet. If a wireless network is available, you can choose it from the Wi-Fi menu , which is also available in macOS Recovery.
1. Start up from macOS Recovery
To start up from macOS Recovery, turn on your Mac and immediately press and hold one of the following sets of keys on your keyboard. Release the keys when you see an Apple logo, spinning globe, or other startup screen.
Command (⌘)-R
MacOS Sierra (version 10.12) is the thirteenth major release of macOS (previously Mac OS X from 2001 to 2012 and OS X from 2012 to 2016), Apple Inc.' S desktop and server operating system for Macintosh.It was the first version of the operating system issued under the June 2016 rebranding as macOS. Sierra is named after the Sierra Nevada mountain range in California and Nevada.
Reinstall the latest macOS that was installed on your Mac (recommended).
Option-⌘-R
Upgrade to the latest macOS that is compatible with your Mac.
Shift-Option-⌘-R
Reinstall the macOS that came with your Mac, or the closest version still available.
You might be prompted to enter a password, such as a firmware password or the password of a user who is an administrator of this Mac. Enter the requested password to continue.
When you see the utilities window, you have started up from macOS Recovery.
2. Decide whether to erase (format) your disk
You probably don't need to erase, unless you're selling, trading in, or giving away your Mac, or you have an issue that requires you to erase. If you need to erase before installing macOS, select Disk Utility from the Utilities window, then click Continue. Learn more about when and how to erase.
3. Install macOS
When you're ready to reinstall macOS, choose Reinstall macOS from the Utilities window. Then click Continue and follow the onscreen 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.
- 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 macOS Recovery exceptions.
- If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.
Please allow installation to complete without putting your Mac to sleep or closing its lid. During installation, your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.
If your Mac restarts to a setup assistant, but 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.
macOS Recovery exceptions
The version of macOS offered by macOS Recovery might vary in some cases:
- If macOS Sierra 10.12.4 or later has never been installed on this Mac, Option-Command-R installs the macOS that came with your Mac, or the closest version still available. And Shift-Option-Command-R isn't available.
- 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. You can upgrade to a later version afterward.
- If your Mac has the Apple T2 Security Chip and you never installed a macOS update, Option-Command-R installs the latest macOS that was installed on your Mac.
- If you just had your Mac logic board replaced during a repair, macOS Recovery might offer only the latest macOS that is compatible with your Mac.
If you can't get macOS Recovery to offer the installer you want, you might be able to use one of the other ways to install macOS.
Other ways to install macOS
- You can also install macOS from the App Store or Software Update preferences. If you can't install macOS Catalina, you might be able to install an earlier macOS, such as macOS Mojave, High Sierra, Sierra, El Capitan, or Yosemite.
- Or create a bootable installer disk, then use that disk to install macOS on your Mac or another Mac.
How to install a fresh copy of OS X on your Mac
New Mac Os
- Shut down your Mac.
- Press the Power button (the button marked with a O with a 1 through it)
- Immediately press the command (cloverleaf) key and R together.
- Make sure you’re connected to the internet through Wi-Fi.
- Select Install Mac OS X, then click Continue.
- Wait.
Can I upgrade operating system on Mac?
Upgrading from OS X Snow Leopard or Lion. If you’re running Snow Leopard (10.6.8) or Lion (10.7) and your Mac supports macOS Mojave, you will need to upgrade to El Capitan (10.11) first. Click here for instructions.
How do I install Mac OS on a new SSD?
With the SSD plugged in to your system you’ll need to run Disk Utility to partition the drive with GUID and format it with Mac OS Extended (Journaled) partition. The next step is to download from the Apps Store the OS installer. Run the installer selecting the SSD drive it will install a fresh OS onto your SSD.
Can I upgrade from El Capitan to High Sierra?
If you have macOS Sierra (the current macOS version), you can upgrade straight to High Sierra without doing any other software installations. If you are running Lion (version 10.7.5), Mountain Lion, Mavericks, Yosemite, or El Capitan, you can upgrade directly from one of those versions to Sierra.
![New Os System For Mac New Os System For Mac](https://o.aolcdn.com/images/dims?quality=100&image_uri=http%3A%2F%2Fwww.blogcdn.com%2Fwww.engadget.com%2Fmedia%2F2011%2F07%2Flaunchpad-with-new-desktop.jpg&client=cbc79c14efcebee57402&signature=8a7cefcbf245502122dc17ec79b4983ef4450957)
How do I reinstall my iMac OS?
Step 4: Reinstall a clean Mac operating system
- Restart your Mac.
- While the startup disc is waking up, hold down the Command+R keys simultaneously.
- Click on Reinstall macOS (or Reinstall OS X where applicable) to reinstall the operating system that came with your Mac.
- Click on Continue.
What is the current version of OSX?
Versions
Version | Codename | Date Announced |
---|---|---|
OS X 10.11 | El Capitan | June 8, 2015 |
macOS 10.12 | Sierra | June 13, 2016 |
macOS 10.13 | High Sierra | June 5, 2017 |
macOS 10.14 | Mojave | June 4, 2018 |
15 more rows
How do I find my version of Mac OS?
First, click on the Apple icon in the top left corner of your screen. From there, you can click ‘About this Mac’. You’ll now see a window in the middle of your screen with information about the Mac you’re using. As you can see, our Mac is running OS X Yosemite, which is version 10.10.3.
How do I install OSX on an external hard drive?
Steps
- Download Mac OS X Lion from the Mac App Store.
- Connect the external hard drive you want to install OS X Lion on to your Mac.
- Navigate to Applications>Utilities> and double-click Disk Utility.
- Select the hard drive you connected from the pane on the left within Disk Utility.
How do I install Windows on a new SSD?
How to Install Windows 10 on SSD
- Step 1: Run EaseUS Partition Master, select “Migrate OS” from the top menu.
- Step 2: Select the SSD or HDD as the destination disk and click “Next”.
- Step 3: Preview the layout of your target disk.
- Step 4: A pending operation of migrating OS to SSD or HDD will be added.
How do I reinstall Mac from scratch?
Choose Reinstall macOS (or Reinstall OS X) from the Utilities window. Click Continue, then follow the onscreen instructions to choose your disk and begin installation. If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
Should I install macOS High Sierra?
Apple’s macOS High Sierra update is free to all users and there is no expiration on the free upgrade, so you don’t need to be in a rush to install it. Most apps and services will work on macOS Sierra for at least another year. While some are already updated for macOS High Sierra, others are still not quite ready.
Can I install high Sierra on my Mac?
Apple’s next Mac operating system, MacOS High Sierra, is here. As with past OS X and MacOS releases, MacOS High Sierra is a free update and available via the Mac App Store. Learn if your Mac is compatible with MacOS High Sierra and, if so, how to prepare it before downloading and installing the update.
Is my Mac compatible with Sierra?
According to Apple, the official compatible hardware list of Macs capable of running Mac OS Sierra 10.12 is as follows: MacBook Pro (2010 and later) MacBook Air (2010 and later) MacBook (Late 2009 and later)
What is the most up to date Mac OS?
The latest version is macOS Mojave, which was publicly released in September 2018. UNIX 03 certification was achieved for the Intel version of Mac OS X 10.5 Leopard and all releases from Mac OS X 10.6 Snow Leopard up to the current version also have UNIX 03 certification.
What OS Will my Mac run?
If you’re running Snow Leopard (10.6.8) or Lion (10.7) and your Mac supports macOS Mojave, you will need to upgrade to El Capitan (10.11) first. Click here for instructions.
Is Mojave available Mac?
Apple announced macOS Mojave back in June 2018 at WWDC 2018, where most of the features were detailed. Apple is keeping macOS Mojave updated with all the latest features. The latest of these updates, macOS 10.14.4 brings Dark Mode to Safari, along with the new Apple News+ service.
Is Mac OS Sierra still available?
If you have hardware or software that isn’t compatible with macOS Sierra, you might be able to install the previous version, OS X El Capitan. macOS Sierra won’t install on top of a later version of macOS, but you can erase your disk first or install on another disk.
What is the current Mac OS?
What’s the latest MacOS. It is currently macOS 10.14 Mojave, although verison 10.14.1 arrived on 30 October and on 22 January 2019 version 10..14.3 bought some necessary security updates. Prior the launch of Mojave the most recent version of macOS was the macOS High Sierra 10.13.6 update.
How do I know what software is installed on my Mac?
Open “System Preferences” from the Apple menu. Click on “Software Update” control panel. Choose the “Installed Software” tab to see the list of installed updates.
How do I do a clean install of OSX?
So, let us begin.
- Step 1: Clean up your Mac.
- Step 2: Back up your data.
- Step 3: Clean Install macOS Sierra on your startup disk.
- Step 1: Erase your non-startup drive.
- Step 2: Download the macOS Sierra Installer from the Mac App Store.
- Step 3: Start the Installation of macOS Sierra on the Non-startup drive.
How do I reinstall Mojave on Mac?
Os System For Mac
How to install a new copy of macOS Mojave in Recovery Mode
- Connect your Mac to the internet via Wi-Fi or Ethernet.
- Click on the Apple icon in the upper left corner of your screen.
- Select Restart from the drop-down menu.
- Hold down Command and R (⌘ + R) at the same time.
- Click on Reinstall a new copy of macOS.
How long does it take to reinstall Mac OS?
Depends on what kind of Mac you have and method of install. Typically, if you have a stock 5400 rpm drive, it takes about 30 – 45 minutes using a USB installer. If you are using the internet recovery route, it can take over an hour, depending on speed of internet etc.
Which is the best OS for Mac?
I’ve been using Mac Software since Mac OS X Snow Leopard 10.6.8 and that OS X alone beats Windows for me.
And if I had to make a list, it would be this:
- Mavericks (10.9)
- Snow Leopard (10.6)
- High Sierra (10.13)
- Sierra (10.12)
- Yosemite (10.10)
- El Capitan (10.11)
- Mountain Lion (10.8)
- Lion (10.7)
Is Mac OS El Capitan still supported?
If you have a computer running El Capitan still I highly recommend you upgrade to a newer version if possible, or retire your computer if it cannot be upgraded. As security holes are found, Apple will no longer patch El Capitan. For most people I would suggest upgrading to macOS Mojave if your Mac supports it.
How do I reinstall an old Mac OS?
Here are the steps Apple describes:
- Start up your Mac pressing Shift-Option/Alt-Command-R.
- Once you see the macOS Utilities screen choose the Reinstall macOS option.
- Click Continue and follow the on-screen instructions.
- Select your startup disk and click Install.
- Your Mac will restart once the installation is complete.
Is Mojave compatible with Mac?
Most Mac models introduced in 2012 or later are compatible with macOS Mojave, and you can upgrade directly from OS X Mountain Lion or later.
Will Mojave run on my Mac?
The Newest Mac Os
All Mac Pros from late 2013 and later (that’s the trashcan Mac Pro) will run Mojave, but earlier models, from mid 2010 and mid 2012, will also run Mojave if they have a Metal capable graphics card. If you’re not sure of the vintage of your Mac, go to the Apple menu, and choose About This Mac.
How long does macOS Mojave take to install?
This is how long macOS Mojave takes to install. The macOS Mojave installation should take about 30 to 40 minutes if everything works right. This includes a speedy download and a simple install with no issues or errors.
Photo in the article by “Flickr”
https://www.flickr.com/photos/fhke/218827402
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