asus tuf gaming x670-e

Help! The motherboard in question is an ASUS TUF Gaming X670-E Plus Wifi, with a Ryzen 7800X3D and 2x32gb Corsair Vengeance 6000MHz CL30 slotted into it. The machine powers on but fails to POST, simply showing the orange DRAM LED. I've tried waiting 15+ minutes, I've shuffled the RAM sticks...