Hey, I'm wanting to play Xbox on my Imacs screen. Being the 21.5inch, it doesn't have a input jack. Just an out put. I've talked with several people i know, and a few tell me one thing, and another few tell me another. What i would like to know is, is there a adapter, or a way i can do this? I know a 27inch can do it, but i cant find out how for a 21.5. Any help would be greatly appreciated. Thanks.