My sansa has no data on it, but Windows media player says its full.

Hi, i have a sansa m240 and my problem is windows media player says it is full,but it has no music on it  i have a screenshot of the problem, i have tried to update the firmware but i cant change it to msc mode because when i was Snowboarding i fell and the screen cracked a little bit, it was in a Dlo case but it still cracked. I can see  only see parts the last few letters of the words, if any of you could help me with this id be very grateful.