I have a dual channel kit G.SKill Ripjaws X DDr3 1333 PC-3 10666 and it seems to only work with one strip installed. The manual says it's recommended to install into banks A2 and b2, but it will not post like that and the CPU error LED lights up on the board. Won't work with a single chip in A2 as well although recommended. Only A1. Is there something that I am missing here?