With most computers having low energy hibernate or sleep modes activated after periods of inactivity, screen savers no longer save energy, and more likely are using more energy than not having one at all.
Screen savers that display any kind of image do not actually save you any energy. If your computer monitor is programmed to go blank on screen saver mode, on the other hand, then you will save energy. If your current screen saver displays an image, it should be possible to program it so it does not, so you can get the resulting energy savings. Even so, if you are going to be away from your computer for even just a few hours, the best thing to do is to simply turn it off, and then unplug the cable from the wall (most electronics sap a certain amount of energy any time they are plugged, even if they are not turned on).
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