Why Does My DVD Just Go to "Trailer" but Not to Play?

So I’m all happy I get a new DVD. I pile the pillows up on the bed. Stick it in the slot, push Play and it plays “the trailer” or the intro. On the screen it says, “Play Movie’ but I can’t make it go to Play. I tried the up and down buttons on the remote. Is the movie to blame or do I need new remote batteries? Other movies play for me.