3 of 4 DIMM slots not working

RAM Slot Not Working? Here's How to Resolve the Issue Random Access Memory is a type of

7PCIe slots Up to300Wauxiliary power One PCIe x4 gen 3 Apple IO card Four PCIe x8 gen 4 Two single height Two double height Two PCIe x16 gen 4 Double

ramses rising slot If no RAM will work in slots 3 & 4 then the Mobo slots would appear to be the problem Filling all the RAM slots on

ramses legacy slot Then maybe you have RAMs with the wrong CL If you have the wrong CL they may not work correctly