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Booting From the OS X El Capitan Installer
- Insert the USB flash drive containing the OS X El Capitan installer into your Mac.
- Restart your Mac while holding down the option key.
- After a short delay, your Mac will display the OS X Startup Manager, which will display all of your bootable devices.
Booting From the OS X El Capitan Installer
- Insert the USB flash drive containing the OS X El Capitan installer into your Mac.
- Restart your Mac while holding down the option key.
- After a short delay, your Mac will display the OS X Startup Manager, which will display all of your bootable devices.
Step 3: Clean Install macOS Sierra on your startup disk
- To format a USB drive launch Disk Utility (Finder -> /Applications/Utilities/Disk Utility).
- Select your USB drive under External.
- Click the Erase tab at the top of the Disk Utility window.
How to Perform a Clean Install of OS X Mavericks
- Restart your Mac while holding down the option key.
- Select Mac OS Install ESD as your boot volume.
- After you’ve booted into the installer, you’ll be able to erase your Mac’s main hard drive using Disk Utility, or choose a separate hard drive or partition to install OS X.
How do I do a clean install of OSX?
To erase your Mac’s main drive:
- Go to System Preferences.
- Сlick Startup disk and choose the installer you just created.
- Restart your Mac and hold down Command-R to boot into recovery mode.
- Take your bootable USB and connect it to your Mac.
How do I wipe my Mac and reinstall?
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. Quit out of the Disk Utility app, and this time choose Reinstall OS X and Continue.
