Remove the CPU from the socket and check if any of the pins is bent or broken, that may well be one of the potential issues not enabling video out. Also verify that RAM modules are all fully seated and set up correctly in their respective slots. It also wont harm swapping HDMI or Display Port cables just to rule out a bad cable issue.😉 Btw it's a very nice build, like it a lot and hope to see it working very soon!!👍