My gopro hero 3 won't turn on unless i take out the battery and reinsert it. If I turn it off, and keep the battery in, it won't turn on again. When the gopro is plugged in, it wouldn't turn on either. I have a mini sd, and the camera will turn on if the mini sd card is in, as long as I take out and reinsert the battery. So the only way I can get the camera to turn on is to take out and reinsert the battery, which would be a huge pain when using it. The battery is fully charged, I plugged it in, and I got the screen which says how much battery there is, and it said 3 full bars. Thanks for the help.
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