Computer won't POST after installing 4 RAM sticks

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*

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ramesses riches slot You can use a tool like MemTest86 or Windows Memory Diagnostic to run a memory test that will check for any defects or issues with your RAM You

ramai123 slot Sounds like you have either the wrong RAM module or the systems firmware is not up to date (I would be surprised if it's not already