Sansa San Disk C240

I purchased this MP3 player only months ago and one day when I was listening to music it just froze and it would not allow me to turn it off. After a while in automatically turned off. Now when I try to turn it on I recieve this white and red capsule looking object??? not sure what this is and there is nothing in my operation manual. I cannot turn my MP3 player on... so I decided to plug it into the computer and when I do the MP3 turns on and allows me to listen to music but it is not registering on my computer thereofore I cannot add or delete files! I removed the battery and replaced it as I thought something may have got lose or something but still no luck. Can anyone help me?

Thank you!