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Click on Disk Utility then Continue first of all to get your Mac’s hard drive wiped.
Select your startup drive on the left (typically Macintosh HD), switch to the Erase tab and choose Mac OS Extended (Journaled) from the Format drop-down menu.
Select Erase and then confirm your choice.
How do I reinstall OSX from USB?
Install macOS from the bootable installer
- Make sure the bootable installer (USB flash drive) is connected to your Mac.
- Shut down your Mac.
- Hold down Option/Alt and press the Power button.
- The startup device list window should appear displaying a yellow drive with Install (software name) below it.
How do I boot my Mac from USB?
How to boot a Mac from USB media
- Insert the USB boot media into an open USB slot.
- Press the Power button to turn on your Mac (or Restart your Mac if it’s already on).
- When you hear the startup chime, press and hold the Option key.
How do I do a fresh 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.
How do I create a Mojave USB Installer?
How to create a macOS Mojave USB installer drive
- Step 1: Acquire a USB drive with 16 GB of storage or more.
- Step 2: Download and install CleverFiles’ Disk Drill.
- Step 3: Download the macOS Mojave Installer from the Mac App Store.
- Step 4: Launch Disk Drill.
- Step 5: Connect your USB drive to your Mac.
Photo in the article by “Flickr” https://www.flickr.com/photos/blakespot/6365506963