I took a look at the ground pin (5) signal coming from the computer. It had a large square wave clocking away on it. Quite disturbing. Nothing to do with the K2 or KIO2. I don't notice any noise from the KIO2 when no computer is connected. It is annoying that none of my computers have worked with the KIO2 so far. It appears the fault lies with the computers, not the KIO2.