did you try different slots? are the channel settings in bios set to auto? have you tried setting the timings manually? if you can get into windows with each stick, use cpu-z to find out your spd timings. they may be different. (i got a stick 10th ann rma'd and the one i got back had 5-3-3 original says 3-3-3).
if all else fails then try two different sticks if you can. if that doesn't work then i guess it's the board.


just noticed you are using a mcw30 to cool the chipset, make sure that it is getting perfect contact or you will get weird boot issues. i open pchealth as soon as i get into bios and check temps, the slightest bump of a hose on mine can cause temps to jump 30c.