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I have a strange problem with my powered USB hub (USB 2.0) and my wired Apple keyboard which is plugged into that hub.

When I turn on the MacBook Pro (Early 2013), running OS X 10.9, the external keyboard is not working sometimes. As soon as I unplug the keyboard and plug it in again it works. This only happens when the MacBook has just turned on.

If I turn the powered hub to an unpowered hub (just by unplugging the power chord) the keyboard works fine - even at startup.

Does anyone have a clue what may be the problem?

  • I don't think you have to use a powered hub for a keyboard. I would recommend you not to use a powered hub if not necessary for the device itself -- this is because you're adding more power than it initially needs. – Rob Mar 25 '14 at 8:10
  • The keyboard is not the only device connected to that hub (there is also a mouse and other devices - e.g. iPhone, iPads - from time to time). Some of them don't work when the hub is not powered. – Alex Mar 25 '14 at 8:19
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You should try using the keyboard extension cable that comes with your keyboard. For somewhat obscure reasons, this solved the problem for me and other people trying to use the Apple Wired Keyboard with USB hubs. See also https://apple.stackexchange.com/a/179299/33925

  • Thanks for your reply. Unfortunately this problem occurred when I was working for another company more than one year ago ;-) But I'll keep that in mind. – Alex Sep 1 '16 at 12:43

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