Answer to "No power - makes a popping sound - fails to turn on."I am having the exact same problem. I have a new 2ds XL and when I turn it on, it turns off after the popping sound. So I opened it and everything works when the back cover isn’t securely closed down. But when I close it and tighten all screws, it does the same thing. My guess that the one causing this issue on mine has something to do with the power or screen cable. Initially I thought its my speaker cables but they’re both properly seated. There is also the wifi cable, the plug next to it or the cables found at the top of the motherboard. I can successfully close it down at the corner where the power switch is and also the other corner where the volume is located but when im about to close the top there goes the shutdown. Anyone who has an idea what could be the reason that is preventing it to turn on when the back cover is closed, please share it here in the comments.