I have an MSI Z270-A PRO MOBO in a new computer and I can only get it to start with one memory stick in the DIMMA2 slot. WHen I put the second 8gb stick in the DIMMB2 slot the EZ debug light flashes between CPU and RAM white, back and forth between the two. I tried putting the memory stick in the DIMMB1 slot and got the same thing. When I put it in DIMMA1 it worked, but it told me at start up it's not optimized. I restarted and that message went away. Also when I check right click properties on this PC it tells me I have 16 gbs installed. Is it fine in this slot? Does that mean those two slots are not working? I thought it might be the memory but if it works in the first slot I don't see why, and it seems strange two slots would be bad.
Any help you can provide would be appreciated. Building this first PC has been stressful >_>