My philips gogear 4gb mp3 player is nt startin what 2 do??

I'd suggest that you format your player or repair it using Philips songbird or device manager. Contents may be removed by using this function. So make sure to back up your contents.

Format:
On your computer desktop, double-click "My computer". Double-click on the MP3 player's icon. Right-click on the Internal Storage icon and then select "Format".

Repair using Device manager:
Launch Device Manager and click the Tool menu and select "Repair", then follow the instructions to perform the repair process. Make sure all other applications such as Philips Plug-in, Windows Media Player or Windows Explorer that access the device are closed or else Device Manager will not recognize the device.

Hope this works.