C150 problems!!!

I’m at school right now, and my c150 mp3 has been malfunctioning all morning. It worked fine, but then I suddenly messed with the headphone cord (they still work btw) and my music suddenly paused. I can shut my mp3 player off, and I made sure the battery was okay. 

My music won’t unpause!

I can select different songs, but none of them play. I get no sound, and it won’t resume.

I don’t have the cord with me…

Does anyone know how to fix this?

EDIT:

When I turn it on, it has the play symbol, but nothing happens. I tried hitting pause then unpause but then it freezes on pause. Again, I can still select differen songs, but none of them work.