First- whenever you remove RAM or make electrical connections on the MOBO, UNPLUG the power from the power supply. You do this by unplugging the power cord from the back of the PSU.
2nd, try using just one stick in the first slot. If it boots, you're looking at either the other stick is bad OR you have the second stick in in the wrong slot. If no joy with the first stick, try the other stick before moving on.
If that fails, pull the CPU and look for bent pins. Usually just a couple of pins that are out of order as compared to other pins.
BTW, I'm assuming you have everything else BUT the RAM, CPU and PSU unhooked. First get the board to pass the built in test, then add more components one at a time. ALWAYS disconnect the PSU plug from the back of the power supply as you go along. I've been where you are, and while it's frustrating, you learn so much when things get screwy on you.
One last bit of advice: If after all these tests are done and you've concluded the MOBO is bad, take a closeup pic of the pins where the CPU goes in AND the serial number of the board. Returns...can be a pain in the rear.