P7H55-M Pro mother board RAM compatibility

Hello,
I have a P7H55-M Pro motherboard, running a Lynnfield i7 processor and 2 sticks of Gskill ripjaws F3-10666CL9D-8GBXL.
My system is not booting up beyond case and cpu fans spinning. I get no video output using a GeForce 8400 card.
Is it the RAM that's killing me? This mobo is supposed to support up to 16GB RAM in 4 slots... I'm using 8GB in 2 slots.
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More about p7h55 mother board compatibility
  1. Problem solved - builder error. After moving the sticks back to their original blue slots and pushing them down until the levers closed on their own, rather than closing them by hand, I now have boot up :). A fine line.

    Now if I can just figure out what to do with this Win 7 spanish only edition I mistakenly bought instead of English.
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