New build

today i built my computer it all works fine untill i plug in my graphics card once i go this it doesnt even boot up i dont have a clue of what top do 

 

my mother board is asrock Z87 extreem 4 and the Asus GTX660 2GB direct CU2

Double checked the cables?

Have you got the two PCI-E plugs plugged properly into the card? 

I helped a mate build a few days ago with that exact card and he hadnly pluggged the plugs in correctly.

thank you so much