OK, I cannot figure this out and I'm usually pretty good at these kinds of things.

We use a Mac Mini to connect to our TV through an HDMI cable. This past weekend it's decided to be off center whenever I switch over from computer monitor to TV. It's not done this before. I tried rebooting the computer, messing with the display options…so far it's always off center on the TV! I'm super annoyed with this. Anybody have any ideas?