Thanks.
However, I seem to remember that when I last did this with the G4 mini after the file load the initial setup process asks a number of questions in order to register the device with Apple and won't let you continue unless you fill them in. Name and address etc.
I previously used a USB keyboard from my old iMac but I sold that a week or so ago.
I have now sold the G4 and need to clean it down and reinstall.