Explain why you shut it down or put it to sleep. I decided to put mine to sleep instead of shutting down. I did some investigating on google and have not found any negative effects to the longevity of any Mac computer by putting it to sleep vs. shutting down. I'm just going to reboot it once a week. I called AppleCare Support and they suggested that it's better to put it to sleep vs. shutting it down every night. Re-boot it once a week.