I have a 15" i7 macbook pro. When I connect it to the power outlet and to my lcd display via dvi cable it works only when the computer's "sell" is open. I tried to connect it via hdmi and it worked with closed clamshell but the picture looks weird so I don't want to use that. For some reason, when I colse the shell, while connected via dvi and plugged in to the power outlet, the computer goes to sleep and won't wake-up... Please help me.