My 3ds turns on but the screens stay black

I bought this 3ds used and it worked fine until I tried a system transfer and then cancelled it halfway through. The 3ds then crashed and whenever I try to open it the blue light turns on but the screens are just black and there is no sound coming out either. I tried opening the system update menu (L+R+A+Up) and it didn't work at all at first but after a few tries I got it to work. My system was up to date and afterwards I was even able to open the 3ds normally but after turning it off I'm back where I started, only the blue light turns on but screens are black and the system update doesn't open up either.