How to Install Operating System on Mac?

How to install a fresh copy of OS X on your Mac

• 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.

How do you reinstall the operating system on a Mac?

How to reinstall macOS while in Recovery mode

1. Click Reinstall macOS.
2. Click Continue.
3. Click Continue.
4. Click Agree.
5. Click Agree.
6. Click on the drive on which you wish to install macOS.
7. Enter your Apple ID and password if you’re asked to, though you might not be.
8. Click Install.

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.