Mp3 is really screwed :S

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you have probably damages the power button on the player. the computer is just reading the data. you need a new one

Could have have possibly turned off the backlight? That could be a solution. Dimming the backlight more and more without paying attention or even turning the backlight off completely it was bouncing around in your pocket. Or if you mean that the screen is completely black and absolutly nothing can be see on it, try to see if you can reset it to factory defaults to see if that will fix the problem.

try updating your mp3s firmware here is the firmware updater tool for your mp3 player   http://www.sandisk.com/driverdownload/download.asp?driverId=7

if this doesn't work i would ether use the mp3 player you have you buy a new one

Very sharp knife, both black plastic covers come off. then 4 tiny screws underneath and u are in.

did you try taking it apart and putting the battery backl in place

Look for part # BA20203R60700443A5Y01EHA4
Model# CS-DJ50SL

This is a replacement battery. Remove the 4 screws around the perimeter of the case and remove the back. The battery is at the top.

The licenses could have expired on the songs, or you have a corrupt database - format the player or get a firmware upgrade to resolve a DB error. Double-check the licenses on the songs to make sure they have not expired.

Go to the Computer Drive Choose the component and Format it by right clicking. THIS WILL DELETE ANYTHING ON THE PLAYER!!!!!!!

Get a new one