MSI Apache Pro GE72

so i've had this issue for a while. My battery is not being detected(??) ( I tried running the dragon calibration thing and it says theres no battery inserted.) I tried getting a new battery. it seemed to charge for hot second and then. boom. same problem. but i got that batter off of ebay so...

She owns an MSI Apache Pro GE72, and I'm trying to fix it for her. She said she saw a BSOD flash right before the problem began. The issue was that when she booted it up, nothing would come up and it would shut down immediately and boot up again after a while. After fiddling with it for a...