[ubuntu_studio] Wireless Keyboard issue

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http://ubuntuforums.org – Hi There, I had a strange problem where by my wireless keyboard wouldn't work on boot up. Mouse works fine. If I unplug then replug the dongle it works. Thinking the keyboard was duff I today bought a new keyboard/ mouse wireless combo. It's a different make, yet it does exactly the same. Anybody any ideas what is causing this? (Hardware)