Good day! I finally decided to wipe my iMac and reinstall el Capitan after always upgrading from lion. My steps: 1- Backup! 2- boot while holding command and R and delete the partition 3- for some odd reason I couldn't do the reinstall from there, it was connecting to the app store but was saying that it was not available. 4- reboot holding command, alt and R. 5- it downloaded something, reinstalled the first OS I had when I bought the iMac (Mountain Lion, I believe) 6- download El Capitan from the app store and it reinstalled. From what I can see is that I am again, doing an upgrade? Is there any way to do a clean install for El Capitan, or maybe you can tell me that this upgrade is doing nothing bad? (like M$...) Thanks for all your input!