Clip screen will not come on

I have a sansa clip that will read when it is connected to a computer.  However, when it is out of the computer, the screen will not come on.  If it is supposed to come on while in the computer, it doesn’t do that either.  The blue lights come on, but no screen menu or nothing will come up.  I’m thinking that it is probably broken,  If you have any idea what the problem is, please let me know.  Thanks,

Antonio Barrow