In addition to the above, most people recommend that you avoid static images for the first 100 hours. Normal 16:9 HDTV is the way to go (or set it to stretch a normal signal). Avoid sports score boards, stock tickers, or logos, etc... If you can hook it up to a computer, you could just run it straight with a screen saver or the windows media player visualization (also works if you have an xbox 360).
This is the standard break in period (IE: avoiding anything that could cause burn in like the plague for 100 or so hours).