This should be a simple thing, but I can't seem to get it to work. I have a new Mac Mini and I'm just trying to get an HD iTunes movie I've purchased to play on my TV. The mini is hooked up via the HDMI cable, the computer is authorized and I'm signed into my itunes account. When I try to play it (in iTunes), I hear the audio but the video is just a bunch of gray and white squares. If I change to full screen, I see it for a second (paused) and then it goes back to the gray and white boxes. Is this one of those "you can't do it because your hi def TV isn't DRM approved" or is there something I'm missing? Thanks in advance for any help.