PC only boots up with one stick of ram

Dec 29, 2014
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HI, I have an asus h81m-k motherboard. An i3 4160 and 8GB-Kit Crucial Ballistix Sport Series DDR3-1600. However, the computer will only boot with one stick in.

However, I have also noticed that when I put 2 sticks in and I remove one to get the pc to turn on again, I sometimes have to change the slot.

In addition, one piece of ram seems to work more than the other, but I'm not 100% sure about this.

Thanks for your help!