Issues with Inspiron 7306

I got a Inspiron 7306 from my cousin which I can't for the life of me get it to work. I can not turn it on at all. I have tried all sorts of chargers with/without the battery, I have unplugged the cmos battery, I have repasted the cpu, I have cleaned it, I have charged it for hours, and have removed the ssd just in case there was a short. If I would to try and turn it on the fans spin up briefly and the keyboard lights up for a second then both turn off and repeat. The screen remains black through this whole process. It will only do this when its plugged into a wall. If it is not plugged in you would think the laptops battery is completely dead. The strange thing is when I run the screen diagnostics the fans spin up and stay on, the keyboard lights up, the cpu warms up (it was cold during the whole bootlooping thing), and the screen works and flashes the diagnostic colors. I would count myself as a pretty techy guy but I need serious help on this. Thank you for reading this all the way through. I will try and reply to comments.