Issues with bottom RAM-slot MBP 2012 - MacBook Pro 13

Issues with bottom RAM-slot MBP 2012 - MacBook Pro 13 ram slot 3 and 4 not working Check the manual for your model to confirm above, and I assume you have updated the firmware of the motherboard, try doing a factory reset of ramses book respins of amun re slot - 4 x DDR4 DIMM Slots - AMD Ryzen series CPUs support DDR4 3200 2933 2667 2400 2133 ECC & non-ECC, un-buffered memory*

ramses book respins of amun re slot 3 Advanced Thermal Design Fully Covered MOSFET Heatsinks; 6 mm Mega-Heatpipe; 7 Wmk Thermal Conductivity Pad; Integrated IO Shield 4 not to accept

ramses legacy slot Hallo, also ich hab das Problem dass wenn ich meine Ram in Dual Channel sprich auf Slot A2 und B2 aufs Mainboard stecke geht der PC nicht an Remove all RAM sticks and place one you know is functional into the first slot on your motherboard Boot your computer If it starts without problems, you know