First Step we recommend that you back up your Mac.
Make sure that your Mac can run macOS Sierra
These Mac models are compatible with macOS Sierra:
- 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)
Preparation:
Download the MacOS Sierra from the App Store using you Apple ID and Password.
You should Have 16GB Pendrive that you can erase.
make sure your USB drive is name "Installer", if not To do this Open Finder, right click on the USB drive name on the left and then choose Rename.
Download Install Disk creator
Creating Install Disk:
Once the download is ready, Close the File screen appearing in front of you.
Open the app. If prompted allow the app to run.
Choose your USB device that we named Installer.
Select the OS X Installer and then Choose the MacOS Sierra Installer
Click Create Installer
if prompted enter your computer Admin password.
Once it ready Shutdown the computer.
Perform a Install:
As now we are prepared we can actually perform clean install.
Turn on the Computer by holding "Option or alt" key on your keyboard.
Select Install macOS Sierra USB drive to the right of the screen.
Select the language.
As we are performing clean install we will format the hard drive, choose disk utility and click continue.
Click on your car drive, name it "Macintosh HD" Format type: Mac OS Extended (Journaled).
and click Erase.
Once its Erase is done your Hard drive is empty.
Now we see the Installer screen and follow the onscreen instructions.
Ready to configure:
once the installation is done.
if you want to use you time machine back up, or data from your other Mac/PC on a this Mac you can use Migration Assistant,or start with a clean user name and password.
Download iMove,GarageBand, Pages, Numbers and Keynote from Appstore.
