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

Remplacement de la carte mère du GoPro Hero4 Silver

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:-)