How do I reinstall operating system on Mac?

How do I wipe my Mac and reinstall OS?

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 get my operating system back on Mac?

Enter Recovery (either by pressing Command+R on an Intel Mac or by pressing and holding the power button on a M1 Mac) A macOS Utilities window will open, on which you will see the options to Restore From Time Machine Backup, Reinstall macOS [version], Safari (or Get Help Online in older versions) and Disk Utility.

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.

How do I restore factory settings on my MacBook air?

How to reset a MacBook Air or MacBook Pro

1. Hold down the Command and R keys on the keyboard and turn on the Mac. …
2. Select your language and continue.
3. Choose Disk Utility and click continue.
4. Choose your startup disk (named Macintosh HD by default) from the sidebar and click the Erase button.

How do I reinstall OSX without disc?

Reinstall Your Mac’s OS Without an Installation Disc

1. Turn your Mac on, while holding the CMD + R keys down.
2. Select “Disk Utility” and click on Continue.
3. Select the startup disk and go to the Erase Tab.
4. Select the Mac OS Extended (Journaled), give a name to your disk and click on Erase.
5. Disk Utility > Quit Disk Utility.

21 апр. 2020 г.

What happens if you reinstall macOS?

It does exactly what it says it does–reinstalls macOS itself. It only touches operating system files that are there in a default configuration, so any preference files, documents and applications that are either changed or not there in the default installer are simply left alone.

How do I reinstall Mac OS from USB?

Install macOS from the bootable installer

1. Make sure the bootable installer (USB flash drive) is connected to your Mac.
2. Shut down your Mac.
3. Hold down Option/Alt and press the Power button.
4. The startup device list window should appear displaying a yellow drive with Install (software name) below it.

1 февр. 2021 г.

What do I do if I can’t reinstall OSX?

First, completely shut down your Mac via the Apple Toolbar. Then, hold down Command, Option, P, and R buttons on your keyboard as you restart your Mac. Continue to keep these buttons held until you hear the Mac startup chime twice. After the second chime, let go of the buttons and let your Mac restart as normal.

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.

Can a Mac be too old to update?

Apple said that would run happily on a late 2009 or later MacBook or iMac, or a 2010 or later MacBook Air, MacBook Pro, Mac mini or Mac Pro. … This means that if your Mac is older than 2012 it won’t officially be able to run Catalina or Mojave.

How do I restore MacBook to factory settings?

How to Factory Reset: MacBook

1. Restart your computer: hold the power button > select Restart when it appears.
2. While the computer restarts, hold down the ‘Command’ and ‘R’ keys.
3. Once you see the Apple logo appear, release the ‘Command and R keys’
4. When you see a Recovery Mode menu, select Disk Utility.

1 февр. 2021 г.

How do I restore my old MacBook to factory settings?

Factory reset

You need to put your MacBook ($760 at Best Buy) into recovery mode in order to erase all of your data and reinstall MacOS. To enter recovery mode, restart your Mac and immediately press and hold Command-R. You can release the keys when you see the Apple logo. Next, you’ll see the MacOS Utilities window.

How do I restore my MacBook Air to factory settings without CD?

How to Reset a MacBook Pro to Factory Settings Without a Disc

1. Set the MacBook Pro to restart. Hold down the “Command” and “R” keys when the gray screen appears during the boot process. …
2. Select “Disk Utility” from the next screen and click “Continue.” Choose your hard drive in the list and click “Erase.”
3. Click the “Mac OS Extended (Journaled)” option in the new dialog.