How do I reinstall macOS on Macbook Air?

How do I reinstall Mac OS on MacBook Air?

Reinstall macOS

1. Install the latest version of macOS compatible with your computer: Press and hold Option-Command-R.
2. Reinstall your computer’s original version of macOS (including available updates): Press and hold Shift-Option-Command-R.

How do I wipe my Mac and start fresh?

Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. Release the keys after about 20 seconds. This clears user settings from memory and restores certain security features that might have been altered.

How do I do a clean install of OSX?

Step 4: Wipe your Mac

1. Connect your boot drive.
2. Start up – or restart – your Mac while holding down the Option key (also known as Alt). …
3. Choose to install your chosen version of macOS from the external drive.
4. Select Disk Utility.
5. Select your Mac’s start up disc, probably called Macintosh HD or Home.
6. Click on Erase.

2 февр. 2021 г.

What to do when MacBook Air says macOS could not be installed?

What to Do When the macOS Installation Couldn’t Be Completed

1. Restart Your Mac and Retry the Installation. …
2. Set Your Mac to the Correct Date and Time. …
3. Create Enough Free Space for macOS to Install. …
4. Download a New Copy of the macOS Installer. …
5. Reset the PRAM and NVRAM. …
6. Run First Aid on Your Startup Disk.

3 февр. 2020 г.

What’s the difference between Apfs and Mac OS Extended?

APFS, or “Apple File System,” is one of the new features in macOS High Sierra. … Mac OS Extended, also known as HFS Plus or HFS+, is the file system used on all Macs from 1998 until now. On macOS High Sierra, it’s used on all mechanical and hybrid drives, and older versions of macOS used it by default for all drives.

How do you clear everything off a Mac?

How to Wipe a Mac Hard Disk Drive (HDD)

1. Make sure your Mac is turned off.
2. Press the power button.
3. Immediately hold down the command and R keys.
4. Wait until the Apple logo appears.
5. Select “Disk Utility” from the OS X Utilities list. …
6. Select the disk you’d like to erase by clicking on it in the sidebar.

How do I reset a MacBook Air 2020?

How to Force Restart Your Mac. Press and hold down the Command (⌘) and Control (Ctrl) keys along with the power button (or the ‌Touch ID‌ / Eject button, depending on the Mac model) until the screen goes blank and the machine restarts.

Where is recovery on Mac?

How to start Mac in Recovery Mode

1. Click on Apple logo at the top left of the screen.
2. Select Restart.
3. Immediately hold down the Command and R keys until you see an Apple logo or spinning globe. …
4. Eventually your Mac will show the Recovery Mode Utilities window with the following options:

2 февр. 2021 г.

How do I reset my MacBook Air to factory settings 2015?

How to Reset MacBook Air: Performing a Factory Reset

1. Click Disk Utility.
2. Click Continue.
3. Click View > Show All Devices.
4. Select your hard drive (e.g. “APPLE SSD”) and click Erase.
5. In the Format field, choose the APFS option if you’re running macOS High Sierra or later. …
6. Click Erase.

2 дек. 2020 г.

How do I reinstall Mac from scratch?

Select your startup disk on the left, then click Erase. Click the Format pop-up menu (APFS should be selected), enter a name, then click Erase. After the disk is erased, choose Disk Utility > Quit Disk Utility. In the Recovery app window, select “Reinstall macOS,” click Continue, then follow the onscreen instructions.

How do I reinstall OSX without USB?

Tutorial

1. Restart your Mac, or power it on, while holding down the Command + R key combination.
2. Release the Command + R key combination once you see the Apple logo on display. …
3. Once you see a window like the one below, click on Disk Utility and Erase your main Mac HDD (or SSD).

31 окт. 2016 г.

How do I reinstall Catalina on my Mac?

The correct way to reinstall macOS Catalina is to use your Mac’s Recovery Mode:

1. Restart your Mac and then hold down ⌘ + R to activate Recovery Mode.
2. In the first window, select Reinstall macOS ➙ Continue.
3. Agree to the Terms & Conditions.
4. Select the hard drive you’d like to reinstall mac OS Catalina to and click Install.

4 июл. 2019 г.

Why is my macOS not installing?

In some cases, macOS will fail to install because it doesn’t have enough room on your hard drive to do so. … Find the macOS Installer in your Finder’s Downloads folder, drag it to the Trash, then download it again and retry. You may need to force restart your Mac by holding down the Power button until it shuts down.

What to do when macOS Cannot be installed?

How to fix “macOS could not be installed on your computer”

1. Try running the installer again while in Safe mode. If the problem were that launch agents or daemons were interfering with the upgrade, Safe mode would fix that. …
2. Free up space. …
3. Reset the NVRAM. …
4. Try the combo updater. …
5. Install in Recovery Mode.

26 июл. 2019 г.

Why is my macOS Catalina not installing?

If you’re still having problems downloading macOS Catalina, try to find the partially-downloaded macOS 10.15 files and a file named ‘Install macOS 10.15’ on your hard drive. Delete them, then reboot your Mac and try to download macOS Catalina again. … You may be able to restart the download from there.