My Sansa won't play mp3's anymore....or link to comp!

I’ve had my Clip maybe 3 days.  At first, it linked just fine.  I loaded it with mp3, and used it.  Then, it suddenly stopped.  When I go to a song, it starts paused, and when I push the play button, the screen changes, but the song doesn’t play.  I’ve tried resetting and formatting, but now my computer won’t link.  What the hell is going on here?  Do I just need to take it back?  Ya know what, I’m gonna post this in case it happens again, but that’s what I’m doing.  Taking it back.