So I finally gave up Windows (we'll see how long that will last) and decided to try OS X full time. I do some relatively advanced stuff here and there so for the last day I was working on setting up the machine to do everything right. The laptop in question is a '12 rMBP 15in with latest Mavericks. Now, I have a Dell U3011 screen which is connected to the system using DP. For some reason the screen won't turn off when the system goes to sleep. It acts as if the cable has been unplugged when this happens. So I'm wondering if there is a way to get it to sleep when the computer is asleep?