First rig, GPUs won’t display anything on boot

Hi, first time miner here, just finished building my first rig, everything works until i plug in the risers and gpus. I have two RX 570 from my PC so they work until i put them on risers. I mean maybe they do work but they aren't showing anything on the screen :/

My guess is i didn't plug something right, here are some pics: http://imgur.com/gallery/84SvsL7

Thanks!!!!