The camera will not power on.
Remove the battery and SD card from the camera.
Reinsert the battery into the camera.
Connect the camera via the USB cable to your computer or USB wall/car charge adapter. Keep the camera powered off, and the red LED on the front of the camera should light up to indicate that the battery is charging. Once the battery is fully charged, the red LED will turn off.
Once fully charged, please try powering on the camera with no SD card by pressing the power/mode button.
No luck? Please email our support team through //gopro.com/support for further assistance.
http://gopro.com/support/troubleshooting-tips-hd/