Replaced 4 G.Skill F2-6400cl5d-4gbpq ddr2-800 cl5-5-5-15 1.8~1.9v pc2-6400 2gx2 (8GB Ram) WITH 4 Hynix 4GB Pc2-6400 DDR2-800Mhz non-ECC Unbuffered CL6 to get 16 GB going on my ASUS P5N7A-VM motherboard, American Megatrends Bio Build 5014 (current) , BUT when I boot up it shows that DIMM B1 & DIMM B2 are EMPTY????????????????? Didn't do this with the G.Skill 2GB DIMM. I have looked all over the web for an answer. AM Meg Bios does not have any section to alter memory slots etc. I don't know what to do. Is it Hynix? Is it the ASUS mother board? I'm 64 now, and could have probably figured it out when I was 20ish, but a recent stroke has allowed me to get this far. ANY HELP OUT THERE? Any ideas? Windows diagnostic doesn't find 'anything' wrong and Belarc says B1 & B2 are EMPTY when they each have matched 4GB sticks in them. Help. Billy