Mac OS X - Energy Saver preferences won't save

Log in as an admin, run the following commands from Terminal:
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sudo rm /Library/Preferences/SystemConfiguration/com.apple.AutoWake.plist
sudo rm /Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist
sudo rm //Library/Preferences/com.apple.systemuiserver.plist
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Reboot. The next time you set your Energy Saver preferences, the settings should stick.