I am building a computer right now with Cougar Mil Spec case, a ASUS Tuf gaming X570-plus MBO, a Ryzen 7 3800x ucp, ROG STRIX RX580 8gb gpu after putting everything together and go to start up the rgb lights on the mbo come on, also the white light on the gpu comes on but that is all. I have tried changing the psu, i have removed all components and reseated them, i have tried clearing the cmos, i have shorted out the power switch pins to see if the switch was bad. I have the 8 pin and the 24 pins plugged in but am wondering about the 4 pin if that needs to be connected to the psu? I am wondering if anyone has any ideas? 😞