Have you tried playing the DVD in a different player? Did you convert the file to DVD format before you burned it? What program/s are you using?
There are a few brands of DVD that my player won't play, other people have found that their players only like certain brands!
http://www.gnutellaforums.com/limewi...-best-use.html

If you use the forum search to look for DVD, you'll find quite a few older threads with more info. Let us know if you're still stuck