Try using godmode9 for a CTRTransfer. If this doesn't work, Unfortunately you may just have bricked your 3ds. These things can happen, even if the custom firmware is installed by a professional. Same thing happened to my brother and his was bricked. He just lost everything on there eventually and had to buy a new one.
Take it apart and make sure that all of the yellow cords are in place. If that doesn't work, get a new battery. And if that doesn't work sorry friendo but you're gonna have to take it to the repair shop and fork out some dineros to get it fixed Hope this may help
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