I am on a MacBook Pro (the one's that came out in March or near that time). It's as up-to-date as it can possibly be. Every time I cut my MBP on, the energy saver preference resort back to never allowing the Computer or Screen to sleep. I have to revert back to default every time I cut my laptop on. What do I need to do to have it save as default, and not have it set to never go to sleep? Thanks!