Chosen Solution
I watched a short video on replacing DVD drive and then performed the task. When I went to start the Macbook it acts as it is getting no power. Battery is fully charged and power supply shows green. But nothing happens when I push the power button.
Double check the top case connection to the logic board.
First of all, which model do you have? The LED light does turn on after you press the power button? After you press the Button power there are any signs of life?