Why won't 'Marley & Me' DVD play on my new RCA?

This is the 2nd Marley & Me DVD from walmart, I took the first back for an exchange. My TV is only 2 months old, a DTV flatscreen(RCA). All other movies work fine, this one makes a horrible humming sound, so loud it almost makes the tv vibrate. I really want to watch Marley & Me.