My mp3 keeps flashing and wont let me play my... (by 2 users)

I have a 5 GB RCA H125PA. I dont know if that tells you anything. Whenever I try turning it on. I will work normally, (turn blue and say loading) but then it will start flashing its blue screen. It says loading but at this point it wont do anything. I tired pushin the menu button and messin wiht the joystick but it wont do anyhting. And then it will take forever to turn it off. Adn then other times when i turn it on it will just say file system corrupted, or somethign to that effect. There is a small dent on the back of it but I'm not sure if that would have anyhting ot do with it or not. I tired pluggine it in to see if that will make a difference but it still flashes. So any help wiht this problem at all would be GREAT! Thanks!