I have an asus p5k ws motherboard( don't laugh, i'm running a pc repair shop). I have 8 gb of ram (2x 4gb hyperx sticks). If i run dual channel in the yellow slots, my pc wont work at all (black screen and no signal). If i run 1 or 2 sticks in the black slots, i get only 2gb of raM. i should get 4 or 8. please help quick, i must return the pc!