I have had my XBOX 360 for 2 weeks now and have noticed that when I play 720p Trailers from the XBOX360 HDD, the picture is a bit jerky. eg: Quake 4 Trailer, Mission Impossible 3 Trailer. Has any one else noticed this or have I got a faulty HDD? Video & Games in 720p from the XBOX360 DVD Drive are fine. Also 720p from my PC is fine, so I can rule out that it is not my screen.