What is RAM ?

Ram Slot Not Working After CPU Upgrade ram slot 3 and 4 not working B550M DS3H ; 1 Solid Pin Power Connector ; 2 DVI ; 3 DisplayPort + HDMI ; 4 Realtek GbE LAN ; 5 Ultra Durable PCIe Slot · PCIe® Slot · Running 1* ram slot 2 not working Reseat the processor and also check with another processor, as the RAM controller on these things are built into the processor and not the

ram slot 2 and 4 Slots 1 and 2 on my MB work fine but if I try 1 and 3 or 2 and 4 then all I get is a blank screen The fans etc are running but nothing is on