ROG laptop G712L blinking battery indicator, and wont turn on (kinda)

It first started with a broken screen, but it was fine, and my parents took it to a repair shop for repair. 4 months later, it was returned and the screen hasn’t been fixed, and when I try to charge it, the battery indicator keeps blinking, and while I can turn it on, it won’t display anything on the monitor. And after fiddling around with the laptop with no experience at all, the power button wont turn on, but when i plug the charger in and out again, it turns on but after a couple minutes, the fans rev up and it becomes noisy.