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#11
In terms of electrical stress, you get more when you turn it on and off.
In terms of thermal stress, if your components are well-cooled, it doesn't matter.
In terms of mechanical stress (this is what usually fails first), your hard drives and your fans will be stressed more when it's on than when it's off.
I leave mine on, but I don't pay for increased electricity (already included in rent :))
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