How to fix pinched hinge cable?

My phone's been working great since I bought it last year, until these last few dags. What's been happening is that the interior screen becomes unresponsive when I close it, then I have to open it a few times using the exterior screen. It sometimes also restarts by itself. It'll even sometimes won't start unless i brush inside the hinge with a soft brush. This time, it's not coming back on. I have reason to believe the issue is the cable running through the hinge, but i haven't found any solutions online for my problem. What's the best course of action?