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Take the battery out and in then charge it for couple hours. It is a waterproof camera no worries. Do not leave the battery in overnight, always take it out or turn off the wifi. Otherwise it drains the battery even though it is turned off. Hope this helps.
I would recommend:
Sorry, there was a problem. Please try again later.The new HERO is waterproof as long as the doors are sealed and remain closed. If you're having issues getting the camera to power on, there are some tips at https://gopro.com/help/articles/solutions_troubleshooting/HERO5-Black-Will-Not-Power-On that may help.
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