My 27" Apple Cinema Monitor (A1316) started to display verical lines everytime I plug it into my macbook. I've tried 3 different macbook pros/airs and all do the exact same thing. The monitor shows the very top menu bar, but the rest of the screen is covered with verical lines for around 10-15mins. The lines start to clear up and go back to normal after a while. Any ideas what could be causing this? Pictures below. Thanks in advance!