I have the same issue and I surrender for almost three months now, and just this morning I open my macbook and look for it's RAM, I removed it both and clean it using an eraser (the teeth like part) and clean the other parts of my mac, now when I put it back and turn on the macbook it work finally!
NOTE: Do not touch the teeth-like part just clean it with eraser.
hope this would work with yours! Good Luck!!! :D