Q: How do I erase my hard drive and instal fresh El Capitan?
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Feb 1, 2016 8:15 AMby JimmyCMPIT,download and install OS X 10.11 and put to a flash drive
https://support.apple.com/en-us/HT201372
boot to that device by restarting and holding down OPTION, then choose the installer
erase your HD with disk utility and format Mac Extended Journeled.
Alternatly if your computer supports recovery mode
Computers that can be upgraded to use OS X Internet Recovery - Apple Support
boot into recovery mode
https://support.apple.com/en-us/HT201314
erase HD with disk utility and reinstall the default OS, then when it completes boot to the OS , go to the App store and download OS 10.11.3
once the OS is installed you will promote to migrate data from a previous computer to the new one. If you skip this process you can use the migration assisting to run it at a later time.
Macintosh HD/Applications/Utilities/Migration Assistant
it is highly recommended you back up your system with Time Machine before proceeding as both processes will destroy all data on the drive. It is also recommend you remove any other external storage device in the event you install or erase them by accident.
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Feb 1, 2016 8:19 AMby John Galt,Easy: How to reinstall OS X on your Mac - Apple Support. Follow the instructions under "Erase your drive and install OS X."
