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My sons 3ds charges, and the screens both come on. I am able to click on the sd folders….they register as empty. Then if I try and touch any other icon (settings, web, camera) the game freezes? Can anyone one give suggestions?

Same thing happened to me after I fixed my 3ds from black screen of death ( move the wifi card around ) the screen comes on but I can’t load any applications camera, Nintendo sound ect. Does anyone know a way to fix this. Thank you