how do you fix a mp3 player?

It was sitting on my dresser, then the cats knocked it over. I didn't know that. So, i woked up the next morning, and something was wrong when i pluged the headphones in. Only one headphone worked. Then I found out it wasn't the headphones, it was my eclispe mp3 player. So, I try different headphones and it still didn't worked. I want to know how to fix the plug. It only works when I pull the wire, to the headphones, up. i want to know how to fix that.