Chosen Solution
Did you happen to reset the SMC and PRAM? Follow these steps to do so and see if that helps, otherwise it could be board level damage. SMC RESET Shut down the computer.Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.Release all the keys and the power button at the same time.Press the power button to turn on the computer. PRAM RESET Shut down the computer.Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in stepTurn on the computer.Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.Hold the keys down until the computer restarts and you hear the startup sound for the second time.Release the keys.
