I got a New3DS XL for repair in today. Completely unmodded device, only a few days old. It turns on, power-led turns blue, then it turns off with a popping sound. I checked all connections of the ribbon cables and wether the wifi antenna was properly seated. Everything checks out. I am completely stumped at this point. Usually it would be best to just return it and get a new one, but this one was on 9.8.