I have an MSI A78M-45 board. 2 8GB DDR3 1600 MHz sticks, all working great.
Then I add a pair of Crucial same specs, and the mobo just beeps, cant get to BIOS screen.
I pulled the original pair, and just tried the Crucial, this time fans come on, but no beeps, no video.
The Crucial sticks are
CT8G3ERSLD4160B.36FKD8GB DDR3 - 1600 1.35v DDR3L DR x
Are you able to tell if its a compatibility issues with this board?
Did you try the new memory in the slots occupied by the original RAM you pulled out? Have you tried the new sticks one at a time by themselves?