Run two sticks. I think that one of your sticks is faulty and that's why you can't boot properly.
Either that or you have a loose or errant standoff under the board which is causing a grounding issue.
I had 4x2 Dominator kit when I first built this system. I was running a micro board before hand and thought I had all the standoffs swapped out and tight. My system wouldn't POST unless I messed with the Cooler and it was laying on its side. Swapped the back to the stock cooler from the H50 thinking that was my issue. I found an extra standoff, and 3 or 4 of the other ones were loose. Removed the errant standoff and made sure all others were a little over hand tight mounted the MoBo and what do ya know, worked perfect. POSTED without issue.
One of the things I noticed before was that I was able to POST using 2 or 3 sticks. Knowing that my AMD board doesn't do well with odd numbers I ran two. But in the 1st two slots. If I tried to run the Red Slots system would not POST.
Now I'm running 2x4 in the Red slots and have had no more issues getting my system past POST.
You might want to check under your board.