Does iMac computer need to be on when charging keyboard or mouse?
Does my iMac need to be on when charging my keyboard or mouse?
iMac 21.5″, macOS 10.13
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Does my iMac need to be on when charging my keyboard or mouse?
Yes, if the items are plugged into the Mac's ports. However, if you have a self powered hub you can plug it into to it while the Mac is shutdown or use a power brick: