I shattered the screen on my two year old set so now I am using a new Samsung TV that I got from my job as a gift. I love the TV but in using it with my ATV2, it will pop up a warning every so often that it will power off unless I press ok on the remote. The sleep timer is off so I am assuming that the TV is thinking that it not receiving a signal so it wants to power off. The TV has three different HDMI ports on the back. Is there a particular one that I should plug the ATV into?