Hey iMac Users. I am on OS X Mavericks and recently something happened therefore I had to reformat and reinstall mav. So, i reformatted the main hardrive to Mac OS Extended (Journaled) and reinstalled Mav on my main HD. However after booting, it went directly to the recovery screen. So i tried reinstalling it again and the same thing happened. What shocked me was, this time I held the alt key while booting up and it only displayed the Recovery partition drive, while my main HD was not there for me to boot up. Please tell me what happen and ways that I could do to solve it? Thank you.