Hey all. I have been experiencing a very annoying problem since a week ago or so. I have googled it and I have found a couple of people with the same problem, it all seems to point to a new security update Apple released with 10.9.3. When my Mac Mini goes to sleep for a long period of time, when I wake it up, I only have a black screen on my Apple Cinema Display. All black, like if the screen was off. Things I have tried: * At first I though it was the screen, but plugged a MBA to it and turned up just fine. * Tried letting the Mini going back to sleep and waking it up again... nothing. Thing is, I can here the volume changing if I press F11 and F12. I here that keyboard beep if I press keys, so the computer seems to be awake just fine. Holding down power button and turning the computer back on, fixes the problem... obviously... I also tried blindly logging in and turning the computer off (left to go to my user in the log screen, enter, entering password, enter, ctrl+eject, enter), and also worked. So it's got to be something with the video driver or server. Anyone experiencing this? Any solutions? Thanks!! EDIT: No new software installed in the last 2 or 3 months. No hardware modifications. No nothing.