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And it's not only the power settings within Windows that can affect your USB ports supplying power. My desktop computer supplies power through the USB ports even when the computer is turned off! Obviously the computer is still plugged into the power socket on the wall and is drawing some power, but it is shut down (i.e. I shut down Windows and not just put it into sleep or hibernate mode). I find this very handy because I can charge up things (including my mouse and Kobo) with the computer turned off.
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