I don't know why I can't remember this, but I can't... I'm selling my iMac* and I want to clear everything off the hard drive and leave or simply reinstall Mavericks and whatever comes with Mavericks, and erase everything else. I've done this before, more than once, but for some reason, I cannot remember exactly what to do and in what order. Appreciate the steps. Many thanks. * Buying a new iMac.