Hi! With Mavericks on iMac 27 "Late 2013 I have a problem, if I put the computer to sleep and try to turn on after about 30 minutes or more, the computer is no longer in the stop state but is totally turned off, in fact I need to press the power button to start. Why? The installation of the Mavericks is clean and is the second that I do. In the first installation of Mavericks that I do, the computer restarts every 10 minutes while I using it.