New To MP3's

I was able to figure out how to download music onto my new c240, but after about 30 days of use, it is telling me to synchronize.  I can not listen to any of the music I’ve downloaded now.  What the heck do I do now?

Sounds like you just need to resync your music.  If your using rhapsody or napster, you need to connect your player and open your music program.  Should happen automatically.