Alphaman06, it could be that the projector is just taking a little too long to sync the signal, so when you switch it from 480p to 720p, you don't see the message that says (basically) "Can you see a picture? Press x button to accept the changes." If you don't press the button in 5 seconds or so, it reverts back to the previous setting. If you can find out which button that is, you can say 'yes' without actually seeing the picture on the screen, and maybe the signal will sync after a few more seconds. I've heard of this happening on some projectors with the original Xbox. If it doesn't work, you could always just flip the switch on the cable again to get back to 480i so you can see what you're doing in the Dash.