I have no idea how it happened, but i plugged it into my computer to charge. and then i just saw my mp3 player and the screen froze and it says usb connecting and when i plugged it out it still said usb connecting and the computer says the device is malfunctioned and the device is unknown!! CAN I FIX IT?! I NEED MY MUSIC!

Ok what you do is plug it up to the Computer/Charger Then It should say USB or Charging. Then Umplug it. It Happens to my mp3 all the time.

It's serious！
The mp4 player can't be turned on. The only method is take it to a repair shop.
Best wishes.

This has happened to me a dozen times since I've owned mine. It's a piece of junk. But to fix it, you'll have to reformat it from 'recovery mode'. Here's a repost of a solution that worked for me:

1. Open My Computer.
2. Switch Sansa to Hold (top switch toward headphone jack).
3. Hold record button and connect to computer thru USB cable.
4. The player should say Recovery Mode and USB connected.
5. In My Computer you should see 16MB FORMAT J: (or another drive letter)
6. Double click the drive
7. Drop down the file menu and create a new folder
8. Name that folder: sansa.fmt
9. Disconnect the USB (either end) and Sansa will format and reset system.

I PLUGGED IN MY MP3 PLAYER TO THE COMPUTER AND THE SCREEN ON MY MP3 PLAYER LIGHTS UP BUT the normal screen image for when you normally plug it into the computer ISN'T THERE AND I CAN'T ADD MUSIC ON MY MP3 PLAYER.

The most common cause is a flat battery. There is a trick to charging

the battery in these small mp3 players. It wont charge if it is turned

on, and it won't charges if it's in sleep mode (zzzz). Here what to do...
1. plug the payer into your USB port. or wall charger
2. switch thje player on
3. turn it off by either holding down the play button, or selecting

"System" from the menu
4. The screen will go black and the battery will begin charging.

sir kindly check the connector and clean the usb port using lighter fluid...thankksss and hope too help you

It could be the usb cable,so shop around for another usb cable for it, if that doesn't work take it (The mp3 player) back to best buy and tell/show them what happened.

You can purchase a "AC to USB" power adapter for about $30

. How to reset Zen v +
http://www.youtube.com/watch?v=22T_gkkZjmM&feature=related

Zen Vision:M Not Responding SOLUTION! to No Charge, Device Not Connected or Recognize
http://www.anythingbutipod.com/forum/showthread.php?t=10960
If that doesn't fix it try the USB cable

All you reaaly have to do is let the battery run out. Then once the mp3 is dead, charge it. The screen should be unfrozen.