

Press and Release Shift + Control + Option + Power keys at the same time. Connect the MagSafe power adapter into your MacBook.

Step 01. Make sure that your Macbook is completely turned off. Resetting the SMC – A macbook with a battery you can’t remove by yourself. Insert the battery and plug the Magsafe Power Adapter back in. Release the power button after 5 seconds. Press and hold the power button for 5 seconds. Unplug the Magsafe Power Adapter from your MacBook. Resetting the SMC – A MacBook with a battery you can remove. One with a removable battery, one with a built-in battery. Screen brightness control is not working.MagSafe Power Adapter indicator light is not working.

(Noisy – fan is spinning too fast or Overheating – Spinning too slow)
