hey i have a i5 2500k cpu and h61m-ds2 motherboard i needed more ram since i only had 2gb so i bought 8gb (2x4gb) corsair vengeance ram for my pc and once i installed it my pc started but wouldnt boot so i took one ram stick out of the motherboard and it worked but only with 4gb not 8gb. what do i have to do to use the other ram stick aswell??? plz help asap thanks.