Introduction:

A Clean installation of macOS Sierra can breathe new life into your old Mac, improve its performance, and resolve any lingering software issues. It involves completely erasing the hard drive and installing a fresh copy of macOS Sierra. Here’s a step-by-step guide on how to clean install macOS Sierra on your Mac.

Step 1: Check Compatibility

Before you begin the process, make sure that your Mac is compatible with macOS Sierra. Compatible models include:

– MacBook (Late 2009 or newer)

– MacBook Pro (Mid 2010 or newer)

– MacBook Air (Late 2010 or newer)

– Mac mini (Mid 2010 or newer)

– iMac (Late 2009 or newer)

– Mac Pro (Mid 2010 or newer)

Step 2: Backup Your Data

It’s crucial to back up all your personal files and settings before performing a clean installation. The easiest way to do this is by using Time Machine, macOS’s built-in backup tool. Connect an external hard drive to your Mac and follow the on-screen instructions to set up Time Machine.

Step 3: Create a Bootable macOS Sierra Installer

To create a bootable installer for macOS Sierra, you’ll need an empty 8GB USB drive and the latest version of the macOS Sierra installer app downloaded from the App Store. Follow these steps:

1. Format the USB drive as “Mac OS Extended (Journaled)” using Disk Utility.

2. Open Terminal and enter the following command:

“`

sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia –volume

/Volumes/Untitled –applicationpath /Applications/Install\ macOS\ Sierra.app –nointeraction

“`

3. Replace “/Volumes/Untitled” with the correct path of your USB drive.

4. Press Enter and wait for the process to finish.

Step 4: Boot into the macOS Sierra Installer

1. Restart your Mac, and as soon as it begins to boot up, press and hold the Option (⌥) key.

2. Continue holding the Option key until you see the Startup Manager on your screen.

3. Select the USB drive with the macOS Sierra installer and hit Enter.

Step 5: Clean Install macOS Sierra

1. From the Utilities window, select “Disk Utility” and click “Continue.”

2. Choose your Mac’s primary hard drive in the left sidebar (usually named “Macintosh HD”).

3. Click on the “Erase” button at the under-menu.

4. Ensure that “Mac OS Extended (Journaled)” is selected as the format and click “Erase” to erase your hard drive.

5. Close Disk Utility after erasing is complete.

6. Click on “Reinstall macOS” from the Utilities window and follow the prompts to complete the installation of macOS Sierra.

Congratulations! You’ve successfully performed a clean install of macOS Sierra on your Mac. Now it’s time to restore your data from Time Machine or set up your Mac as a new device without any old data.