Hi! I'm going crazy for how much trouble I'm having with my iMac late 2012 after being passed to the Mavericks. At the first "clean" installation - The computer was restarted on its own after a few minutes of use, many times a day. At the second "clean" installation - No more reboots while I'm using the computer, but 9 times out of 10, when I put it to sleep and I'm going to wake up, wake up instead of reboots! - If the computer is in sleep for more than 70 minutes, instead of remaining in sleep, it restarts by itself! I went back to Mountain Lion but always finding these problems. I do not have the Recovery HD partition and Logical Volume Group name is Internal Drive, was the first Macintosh HD. How can I fix it? Before Mavericks have never had problems, they are several months that I have this iMac. I did one test in SafeBoot, and it does not happen, I do not know if it was just luck!