Computer not recognizing Sansa Fuze - SOLVED!

After trying EVERYTHING suggested, I was still unable to "make contact ".   I then remembered I’d gone through something like this before and after swithing to a different USB Port I had instant success!  I was using a 4-Port USB Hub (USB 2?) but without success.  After plugging into a Port directly on the back of the tower it worked.  I had this problem before with a USB mouse.  It refused to work on the back USB Port but would work fine on the front Port.  Freaky!