My setup: MIS X370 Gaming pro carbon, Ryzen 7 1700, 2x4gb Adata XPG 2400mhz, RX 580, 700 watt bronze power supply. So basically when I occupy ram slot A1 or B1 (Or both) the cpu & memory LED light up and I don't get any video, but all the fans spin up and stuff and the other slots work fine...