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'Green Screens' Campaign:
Mac OS X 10.1

Saving Energy while using a Screen Saver
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Step 1 of 2: Set the Screen Saver Delay:
  1. From the Apple Menu, choose "System Preferences"
  2. Click the icon labelled "Screen Saver"
  3. Use the "Time until screen saver starts" slider to set an appropriate delay

Screensaver Control Panel

Step 2 of 2: Set the Energy Saver Settings:
  1. Click "Show All"
  2. Click the "Energy Saver" icon
  3. If you want to put your entire computer to sleep, choose the time using the slider named "Put system to sleep when it is inactive for:"
    Note: when your computer is asleep, it uses very little power, and it is essentially turned off, i.e. it can't do anything.
  4. If you only want the screen/monitor to go to sleep, click the box labelled "Separate timing for display sleep" and choose an appropriate time
    Note: if you choose a time that is shorter than the amount of time before the screensaver starts, you will never see the screensaver!
  5. For extra savings, also click the button labelled "Separate timing for hard disk sleep"

Screensaver Control Panel