Does the board work with only 1 stick, and you have tried both sticks seperately to make sure one of them is not bad?
If so go ahead and do this:
Install 1, go into the BIOS, make sure the settings and voltage are being detected and set correctly. The voltage especially, make sure it is set at 1.9. If that doens't work, try setting the voltage to 2.0. I wouldn't go above that though.