I recently upgraded from a i5-2390t to an i5-2500k on MSI P67-GD53 lga1155 after install, computer will not boot with DIMM 1 & 2 occupied, tried switching out ram, no sticks appear broken/bad and I am certain I did not put any stress on the ports to break a solder. almost not worth the cpu upgrade to be running at only 8gb ram. G. Skill sniper RAM. Currently running system with DIMM 3 & 4 only