Hi I use a MBP hooked up to a 30" ACD. In Snow Leopard, I could: (1) close the MBP lid and it would go to sleep (2) click the external keyboard/mouse and the MBP would wake up and pass the video signal exclusively to the ACD. (3) I could then open the MBP and its screen would stay blank - this helped with keeping the MBP cool. But in Lion, this no longer works. I do (1) and (2) above, but when I open the MBP at step (3) the MBP screen flickers back to life - even though I don't want it to. Anyone know a solution for this? I can leave the MBP in clamshell mode, but it heats up a lot and the sound of the fans going round at 4000 RPM is amplified by having the lid closed. Thanks for any help you can give.