Hp Probook 4431s Won't Turn On

[AlexanderDewant]

Hello, so I have a problem with my Probook 4431s  (dual gpu) that I downgraded from windows 10 to 8.1 about 2 weeks ago. At first everything works fine, but 3 days later the touchpad and the audio in port stops working, and only 1 usb port works. But then a week later sometimes it won't turn on, I managed to turn it on by hard resetting like in this video h(ttps://youtu.be/-WoLBkrqv6U). It has been like that for a week, before finally it won't turn on at all around 2 days ago. I tried every solution on that video except the cmos battery because I'm not confident opening the laptop. Is there any way to turn it on without prying it open or go to get it fixed somewhere? Thanks in advance!