I have a GTX 670 4gb ---> "http://www.newegg.com/Product/Product.aspx?Item=N82E16814121659" and a asus P8Z77-V LK ---> http://www.newegg.com/Product/Product.aspx?Item=N82E16813131837 , when i plug the Gpu into the mobo, it won't display anything, but when i take the GPU out, it boots up like a charm. thats all i got, help if you can thanks!