Keyboard has a strange software related Issue I have an Issue wIth my Apple keyboard where the "I" key does not work In lowercase mode.
When I checked usIng the keyboard vIewer, It shows that the lower case "I" Is trIggerIng a  double ⌘ (command key)
I have trIed a dIfferent keyboard (I use an apple bluetooth keyboard and have trIed replacIng It as well as usIng a separate USB keyboard)
I have an IMAC 10,1 runnIng OS X 10.6.8
Any and all advIce welcomed
The most common cause of one key not working is that it has been set as the trigger for something, most often either Speech Recognition or Text to Speech.  Double check the settings in your system preferences/speech.