So I'm currently building a gaming system for my nephew, and mind you I've built/upgraded plenty of computers. But this was the first time I've ever encountered this situation, where the fans will work but the USB's and the HDMI isn't posting up. I bought him a used Ryzen 5 1400 from hardwareswap Reddit and a used AB350M-HDV from the same person, but I got him a new RAM from Frys (https://www.frys.com/product/9642653?site=sr:SEARCH:MAIN_RSLT_PG). I'm confused to why this is happening since both RAM lights up and most Ryzen 5 CPU's are compatible with 3000mhz. could it be the cheap motherboard or could it be that my CPU is clapped? would clearing the CMOS help?