3DS Starting and shutting off

I have a 3DS XL (Retro NES SE if it matters), I haven’t had really been rough with it or anything but it is turning on and the imideitly back off. Would really like to know how to fix or where I could pay to get it fixed. Ant help would be great thank you!!!

Have you tried re-seating the Wifi card? that usually helps with the Blue light shuts off after a while.