When using a projection screen you will have to hook it up to an external device such as a laptop or DVD player to get it to display images, text and videos. To get the projection screen to blackout, you simply have to manipulate the external device connected to the screen.
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Turn the external device to "standby" by pressing the power/standby button. Sometimes this will result in a black screen, other times a blue screen.
Put the external device to sleep; sometimes you will be able to set a timer for sleep mode. The screen will blackout. Because your external device is connected to the projection screen, the projection screen will also blackout.
Make the desktop on your laptop black. Remove all other icons from the desktop. When your laptop is turned on and connected to the projection screen, it will be blacked out.
Make a totally black slide out of presentation software such as PowerPoint or Keynote. If you want the screen to blackout during a presentation, you can place a blank, black slide in between slides with content. When the black slide appears, the screen will simply look blacked out.
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