Hi, I have a Macbook which works pretty well but the battery is terrible. It will be fully charged but the battery will last me a maximum of 3 hours if I'm lucky. When I close the lid or put it to sleep a light fades on and off and it uses up a lot of my battery. This is just a theory and I have looked online but no one else seems to have this problem, but I have a feeling it does use battery because if I close the lid with 3 hours battery when I open it 2 hours later I will only have 30 minutes of battery left. How can I turn this light off? Even if it doesn't waste battery it is rather irritating at night. Thank you so much.