First try resetting it = To reset your zen = Put a pen head in the hole under the power button for 20 seconds.
A depleted battery may have any of the following symptoms:
The charging icon is missing
The blue power LED is not blinking
The player turns off immediately when it is disconnected from its power supply
Not showing any signs of activity (with the exception of the blue power LED)
No LCD display
The player is not detected by Windows or any programs
If the player shows the above symptoms, download the firmware below and
follow the step by step instructions to install the firmware update.
http://www.creative.com/support / downloads, firmware.
May have to format if nothing eles works.
http://www.creative.com/support/ downloads