Help needed sansa clip plus

Hello, i have trouble with my beloved sanidksa sansa clip plus. I added 2 mp3 files into internal memory and since then it is freezed on "refreshing your media" screen. I dont know what to do when i turn it off by pressin power button it goes off and fter turning it on the screen is still frozen. I cannot format it since the comptuer dosent recognize it as a drive because it is not fully on I guess. What do I do is there any hope for this little guy? Please, help