have you tested each of the memory sticks with memtest86?
I have not yet. However, when all four sticks are installed, I am only able to get into the Biostar Bios set up screen. It detects all 4 memory sticks and reads 4,096 mb of RAM. Although, it causes a conflict with the hard disk drive nor boot. I saw in the help FAQs on Biostar's website for another model board to try crossing the memory sticks by splitting the pairs one new in Dimm 1, one old in Dimm 2, etc. Will this maybe work?