Problem with new DVDs
What you need to do is test on another player to make sure, but the chances of getting three defective discs are about the same as getting hit by lighting. Still, testing on a different player will tell you and us if the problem is the disc or the DVD player. I see you already played the discs successfully on your computer and this shows there really isn't anything wrong with the discs. Playing on another DVD player should rule out any other possibilities.
One of the problems with adding premixes and advanced features to a DVD is that it can cause problems with a few players. Usually, these problems will be minor and only affect the playing of some of the premixes, but in other cases more severe problems can result. I'm not saying this is what is causing your problem as there really isn't any way to know and your problem could also be caused from many other factors. For instance, your players lens may just need to be cleaned, but unfortunately it isn't possible for us to really give you a definite answer.
