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My Hero 3 Black would not turn on. I tried every last trick that I could find on the internet.
Right before I was about to throw it in the trash, like any man, I decided to see what was on the inside. With the guts exposed, I continued to try an get it to turn on. I then noticed that there were two "wires" going to the motherboard. I disconnected them and it turned on. I then hooked up the SD card wire and it would not work. I removed the SD card wire and then installed the image sensor wire. To my surprise, it actually turned on. I then decided to install the SD card wire, but once again, it would not work. With some simple troubleshooting, I decided that the SD card board was bad and bought a new one from ifixit.com.
With a new SD card board from ifixit.com, I now have a fully functional Hero 3.
Please view my YouTube video on how I repaired my camera.