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Manually activating power management on Macs

Follow the instructions below for Mac OS X Version 10.4, nicknamed "Tiger". Steps for activating sleep settings in other versions of OS X will be very similar.

  1. Click on the apple symbol (Apple Menu) in the upper left of your screen.
  2. Go to "System Preferences"
  3. Click "Show All" (if necessary)
  4. Select "Energy Saver" from the "Hardware" row
  5. Set "Put the computer to sleep when it is inactive for" to 30 minutes using the slider
  6. Set "Put the Display to Sleep when the computer is inactive for" to 5 minutes using the slider

Mac Energy Saver screenshot

EPA recommends setting computers to enter system standby or hibernate after 15 to 60 minutes of inactivity. To save even more, set monitors (displays) to enter sleep mode after 5 to 20 minutes of inactivity. The lower the setting, the more energy you save. The "Put the hard disk(s) to sleep when possible" setting does not save much power, and can be ignored.