Apple USB keyboard does not work

I have the same problem as described by Sweboss on November 15th, 2012. The Apple USB keyboard is working perfectly, but if I shut down the computer, when I switch it on again, the USB keyboard does not respond, and the computer is looking for a Bluetooth keyboard (which I had before). I have tried switching off, unplugging all peripherals, then unplugging the computer, waiting 15 seconds, then plug it in, wait 5 seconds (this is a remedy proposed in other mails). Switch on and the USB keyboard does not respond. It is not that particular USB port, as it works perfectly well with other peripherals like my scanner, or printer, and changing ports does not help. And when I tried it last time, I had no other USB peripherals connected. Can anyone help?

That is definitely some strange behavior, good to finally be working, but does not explain exactly what causes the behavior.  Could have something to do with the energy saver part of the operating system, or a miscommunication with the USB bus itself.  With multiple USB ports it would be good to test on different ports to see if that is an issue.  Anyway, it is working now and that is good.
Another I don't know why but it works: a couple months ago a user was having problems with a wireless keyboard.  The keyboard-iMac communication resulted in random charaters, time lag, and other bad behavior.  The user finally found by accident that turning the keyboard off, removing the batteries, and then spending about five minutes just pressing keys, placing the palm of the hand on the keyboard and pressing, just pressing and pressing, and then replacing the batteries and turning on the keyboard, it worked fine.  Seems like it is necessary to just force the keyboard to discharge all of the key switches.  Those keyboards use capacitance switches instead of mechanical switches.  So they retain a charge.
While that was a wireless keyboard, I wonder if that was what happened in a way with your keyboard...the unplugging and leaving it for a period of time, any charge may have dissipated and it would work again.  If this happens again, try the above procedure and see if it helps.

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