@Jordy sometimes happen to me on my New 3DS **with custom firmware** - powers up, sound, I can interact (buttons + touch screen working) but no screens. I was forcing shutdown but I noticed I just have to close the console and reopen it. Times ago it did crash too the game cart detection, even up to break the power charging. I was about to solder a new connector when everything went back to absolute normal state. Very very weird.