Pc won’t turn on

So I was randomly playing a game and my pc decided to completely shut down. It won’t turn on unless I hold my power button which only opens the fans and the rbg, still no display signal. I tried to connect the display port to the motherboard and removed the gpu cable. And it works it’s just when I turn my pc on it says I need to put a pin or something. When I mean it works it doesnt show the graphics card (because it’s plugged in the motherboard) im thinking there’s a problem with the cable that connects gpu to the psu. I’m using 9070xt so I have to use 12v 2x6 in guessing and yea just doesn’t work if I use my displayport to my gpu. Anyone know what I can do?