System refuses to post with ram in ||_ _ Config

[jhu2]

Overview:
New build and the system refuses to POST when the ram is placed |_|_but it will POST in both single configuration, and ||_ _ configs.

Specs:
GIGABYTE GA-B75M-D3H
i3-3220
OCZ SSD Vertex 4
G.SKILL NS 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666)

System POSTs when each ram is ran by itself or in ||_ _. However according to the manual it should be in |_|_.

Any ideas?

Thanks

 

[scout_03]

page 11 of board tell slot 1 and 3 for dual channel these slot start from right to left