If it's still makes any sense, then here's the answer: You should disconnect battery, so it wipes cache and other temporary data from your Macbook. Do it on your own risk. Unscrew all screws on bottom housing, don't lose them. Carefully unplug all wires. Unscrew battery protection plate, and remove it. Disconnect the battery (Don't remove it!), leave your Mac for 30 minutes. Plug it back and repeat that process again. Finally your Mac should be working again! I'm not responsible for any data losses and other damage to your Mac.