There are a couple of possibilities. Where did the MP3's come from? If you
purchased them on the web or ripped them using Windows Media Player, they are
probably protected (Digital Rights Management) and cannot be distributed.
PowerPoint is considered a distribution tool.
Another possibility - - have you moved the presentation? If so, the links have
probably been broken. See:
Sounds/Movies don't play, images disappear or links break when I move or email a
presentation
http://www.rdpslides.com/pptfaq/FAQ00155.htm
Finally, the path to the MP3's may be too long. Try moving everything to
C:\Test, for example, and delete and re-insert the MP3's and then test. If it
now works, the path length was the issue.
--
Sonia Coleman
Microsoft PowerPoint MVP Team
Autorun Software, Templates and Tutorials
http://www.soniacoleman.com