You can use OS X Recovery to erase your computer using Disk Utility and then reinstall OS X. Source: OS X: How to erase and install – Apple Support
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About Phil Ayres
Phil Ayres is the Chief Marketing Officer of Nobilis Health in Dallas, TX. Prior to Nobilis Health, I was the Director of Marketing for Travelocity.com in Dallas, TX. And, before that, I was the Director of Digital Marketing at Hotels.com - also in Dallas.