MAC - Format and set up a clean install of OS X

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- Save your data on your extern disk - Download the last OS X version through the App Store - Format a USB key through the Terminal by command:

sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/Sans\ titre --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app --nointeraction

- Restart your computer and press the ALT button - Optional: you may need to format your disk if you set up a new SSD hard disk for example (follow the steps though the Utilities Tools) - Install your clean OS X

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