Battery fully charged but camera dead

Hi

If your GoPro isn’t turning on I would try a good SDcard (that’s compatible)and if you have tried that ,open it up and have a look for anything strange in the main board

Keep a eye out for corrosion as it’s quite common on GoPros as people sometimes forget to put the waterproof housings on them

Here’s a guide on dismantling it

GoPro Hero4 Silver Motherboard Replacement

If you see any corrosion try cleaning it away with some isopropyl alcohol

If it’s all clean on the main board I would start looking at the flex cables and if they are all good try plugging it into the GoPro Quik app as it might just need a update

Hopefully this helps

Any questions please ask

Thanks:-)