It has come to my attention that it may be the "high density" of the new memory modules that is not compatible with my motherboard, I need low density instead. Does this make sense?
Actually, no motherboard with an Intel chipset supports any memory modules made with x4 ICs. You will need memory modules made with x8 ICs (those are "standard-density" modules). You can find low-density modules made with x16 ICs - but Intel does not support the use of double-ranked modules made of such ICs (only single-ranked modules made of x16 ICs may be used). Double-ranked memory modules to be used on any motherboard with an Intel chipset must be made with x8 ICs.
Hope this helps.
Thanks for the answer. I ordered replacements for the RAMs that did not work...