Hi, I have a MacbookPro 15Retina late 2013 with two video cards. When the system sleeps for a while, the computer simply turn off and doesn't recover as usual. It also happens when closing the physical screen. Have upgraded the OS, have tried to manage the Energy setup unsuccessfully. As a last effort I reformatted and installed OS from scratch with no success. I am afraid there's a hardware problem, but before sending to Apple I would like to know if anyone have experienced something similar. Thank you!