I have a MBPr 15" and display, I know their are tons of threads on this problem, can't seem to find this on Mavericks, though. The charger that's built-in the display works fine and charges correctly, so it's certainly not a power problem. I tried everything possible, plug it back in, restart, reset pram and smc, and it's updated to the latest preview (6). System report status says that their is no device connected. Keep in mind that it worked correctly on ML IIRC. The display doesn't respond, it's just black. Any help?