Sansa MP3 not working

Hi,
Try these steps:
SOLUTION 1 - Reset the device. 
1. Press and hold the Power/Menu button for approximately 20 seconds. 
2. Release the Power/Menu button. 
3. Press the Power/Menu button again to turn on the player. 


SOLUTION 2 - Power cycle the device. 

STEP 1 - Remove the battery 

STEP 2 - Power cycle the player 
1. Connect the device to the PC. 
2. Leave the device connected for about 2 minutes. 

STEP 3 - Turn on the device 
1. Disconnect the player from the PC. 
2. Insert a fresh AAA battery into the player. 
3. Turn on the player.