I put in a MSI B450M PRO-VDH and paired it with a new 5600x CPU. The systems powers on but the debug LEDs tells me there's a problem with the CPU and the DRAM (probably because of the CPU). I had gotten the board updated to the latest BIOS (would be the either MG3 or MD) installed by a local PC shop. Compatibility says it should support the 5600x (way at the bottom). I checked the CPU and saw no broken/bent pins. The CPU power cable was firmly in place. All fans were spinning.