My usb keyboard is no longer detected after the power was switched off

I sometimes relocate my Imac to another office and after the power has been switched off the computer no longer detects my usb keyboard.
This had happened several times now and sometimes it all of a sudden starts working again after a couple of hours (but it doesn't now).
The computer keeps searching for a wireless keyboard which I don't have. I have tried everything from switching off power again to reboothing, but nothing works. I have checked all USB ports with other devices and they all work. The problem is not the keyboard itself, because it does work when I plug it in to my MacBook.
Anyone recognize this?

Yes, to a blue tooth mouse only. I have tried disabling the blue tooth connection, but when i restart my computer it automatically connects again.
I got the keyboard to start working again now by pressing all the keys one by one (in order to discharge them, read that somewhere). I helped. But how annoying is that?!

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