Computer won't POST after installing 4 RAM sticks

ram slot 3 and 4 not working   Dan ram slot 1 and 3 or 2 and 4

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*

Also try only one stick of RAM at a time in the first slot that the motherboard manual says to use Try switching the RAM modules around the slots Try running the PC with just one module in a slot which is not working

habanero mobile slot malaysia 10M Followers, 3 Following, 307 Posts *Please refer to CPU support list for details Chipset - AMD B550 Memory - Dual Channel DDR4 Memory Technology - 4 x DDR4 DIMM Slots - 3-pin or 4-pin fan