I also have a 5500XT for the gpu. I am assuming it needs a bios update. I seen a video on YouTube where a guy had the same problems, he took a different AMD cpu and upgraded the bios, then the 1600 AF would post. Is that the only fix for this, I have returned the mobo and psu, new ones gave same results. I have built many gaming systems with no problems. The only other thing it could be is the I/O on the case. When I give it power all lights come on and no fans, cannot use reset button or the power button.