SO-DIMM DDR4 Memory

slot is working then my first suspect would be bent Pins in the LGA Socket as they are very easily bent as there tiny Soft gold pins so

DDR5 SO-DIMM Socket status based on JEDEC standard, and DDR5 vs DDR4 full spec comparison

ddr4 slot vs ddr5 Connectors Memory Connectors Memory Socket Connectors DIMM Connectors DIMM Connectors DDR4 SODIMM 260P STD TE Connectivity Alcoswitch

ddr4 vs ddr5 slot We offer industrial grade SO-DDR4 266624002133 memory with 30μ gold plating connector featuring low operating voltage with faster burst