Sansa Clip Not Recognized By Computer

I have a Sansa Clip and until last night, I was able to downlad music from my computer to my Sansa Clip.  Now, I can’t.  Any sugestions??  Thanx.

Did you try a Clip reset?  On the original Clip, hold the slider on button uppermost for 30 seconds or so; on the Clip+, hold the on button down for 30 seconds or so (or even up to a minute or so).