I have a Early 2011 MBP13, and i have it hooked up via a genuine Apple Mini DP to DVI adapter to my Samsung P2770HD Monitor. When the display sleeps, the samsung monitor will sleep but then cycles on and off repeatedly just displaying the words "No Input Signal" when on, for the entire day/night. The MBP LCD however stays off. I cannot figure out what is wrong, but i did try another monitor on my and it works fine. I think its probably a compatibility issue with the samsung monitor getting along with the MBP, since the Samsung monitor worked fine when hooked up to my desktop PC. Anyone have any idea or similar experience in which i can fix this problem? I contacted samsung and they had no suggestions.