Responder a:Display turn Black, after many times turn off and on, sometimes worksI don't know if this comment will help anyone, but not sure where to post my "epiphany". My 30" inch Apple Cinema display after having been turned on for a while would suddenly turn off for several second and then back on. It would do this continuously, really frustrating trying to get some work done. As it turned out, this problem was the monitor getting hot, I clipped a simple 6" fan (from Target) to my desk blowing across the back of the monitor, monitor stayed cool and it solved the problem. Hope this helps someone.