Hey guys, I just replaced my motherboard with the assumption that it was the reason my PC wasn't booting when my RAM was in a certain configuration but now it's still not booting into BIOS (only the fans spin up) when all four slots are filled. While all four RAM sticks are in, the DRAM Debug LED also lights up. I tested all four slots with a single stick, when DIMMA1 and DIMMA2 were occupied, the PC booted but it said "Memory module in non-optimized slot" and when DIMMB1 and DIMMB2 were occupied it started normally. However, at all times, the BIOS only read a single stick of RAM, the one in slot DIMMB2. I also checked the CPU for bent pins are there were none. What's the problem here?
CPU: Ryzen 7 3700X
Mobo: MSI X470 Gaming Pro Max
RAM: 32GB (4x8) Corsair Vengeance RGB 3600MHz CL18
GPU: Zotac GTX 1070 Amp! Edition
CPU: Ryzen 7 3700X
Mobo: MSI X470 Gaming Pro Max
RAM: 32GB (4x8) Corsair Vengeance RGB 3600MHz CL18
GPU: Zotac GTX 1070 Amp! Edition