Not sure if I should post this here or in peripherals, but I was just at the Apple store and I picked up a Mini-Display Port adapter. My intentions were to hook it up to my TV so I could watch movies lying down in bed on the TV rather than having my laptop burn my legs half way through the movie So to the point of the thread: I tried to hook it up and it seems to work ONLY with my MacBook display open (not shut). If I don't shut the screen, then the full picture does not appear on the TV, there are black lines on the sides (left/right). When I shut it, the lines disappear and the picture refreshes... however the picture quickly goes away after about 10 seconds. I am having the same issue on my Samsung monitor. Faulty cable, adapter or port eek? What's causing this problem? When I had a whitebook and the adapter for that one, I hooked it up no problem to my TV/LCD. I also had to close the lid or else the picture wouldn't fit the screen, but I don't mind doing that.