How do I format and reinstall macOS X?

How to Wipe Your Mac and Reinstall macOS from Scratch

Step One: Boot From Recovery Mode, or an Installer. Your Mac’s Recovery Mode is a treasure trove of useful tools, and it’s the easiest way to wipe your computer and start from scratch.
Step Two: Securely Wipe Your Hard Drive (Optional)
Step Three: Reinstall macOS.

How do I reinstall OSX High Sierra from USB?

To install High Sierra from a USB using your startup disk drive:

Go to System Preferences.
Click on Startup Disk and select the installer.
Restart your Mac.
Hold down Command (⌘) + R to boot into recovery mode.
Connect your macOS High Sierra bootable USB.
Within a few seconds, a macOS Utility screen should pop up.

How do I restore my Mac to factory?

How to Factory Reset a Mac or MacBook (macOS Monterey)

Click the Apple icon in the menu bar (top-left corner).
Select System Preferences from the drop-down menu.
Select ‘Erase All Contents and Settings. ‘
Enter your password, select ‘OK. ‘
Select the ‘Erase All Content & Settings’ button.

How do I reinstall OSX Sierra?

You can reinstall macOS Sierra or macOS High Sierra by doing the following:

Back up the Mac before beginning.
Reboot the Mac and hold down COMMAND + R keys concurrently right after you hear the boot sound, this will boot the Mac into Recovery Mode.
At the “macOS Utilities” screen choose “Reinstall macOS”

How do you restore Mac OS X?

Reboot your Mac.

Hold the “Command” and “R” buttons until the boot chimes are triggered.

You will see the OS X utility window that will prompt you to choose one of the four options.

How to clean install Mac OS from USB?

Connect your boot drive.

Start up – or restart – your Mac while holding down the Option key (also known as Alt).

Choose to install your chosen version of macOS from the external drive.

Select Disk Utility.

Select your Mac’s start up disc,probably called Macintosh HD or Home.

Click on Erase.

Wait for your startup disk to be formatted.

How do I uninstall Mac OS X?

Uninstall OS X El Capitan manually. Click on the Apple icon in the top left part of the desktop and select Restart from the drop-down. As the machine is restarting, press Command + R. Select Disk Utility on the Mac OS X Utilities screen and click Continue. Highlight the startup disk and hit Erase tab.

Does Mac OSX have a system restore?

Go to the Apple menu.

Click Restart or power on your Mac.

Hold down the Command – Option – R keys immediately after your Mac starts.

Release the keys when the globe appears on the screen.

Wait for the Wi-fi menu to appear.

When the Wi-Fi menu appears,choose a Wi-fi network to connect to.