Yes, I can turn it off.
I think I'll just look for someone with technical knowledge to look at my 3ds for me. The problem seems a lot more complicated than I'll probably be able to solve on my own. Thanks everyone for the help anyway.
What do you mean?
Hey, I actually didn't try that. Will try it and see if it changes anything...
Already did that :(
So, is there something I can do to fix that? (besides buying another one?)