> > You could try to unplug all USB stuff except for the keyboard - I've 
> > seen that problem before. Another alternative is to try an ADB keyboard.

>       The keyboard is an ADB keyboard.  I have no USB devices.  No extra 
> hardware on it.  Just a couple of hard drives, and slightly over 750MB 
> of RAM.

Then maybe try a USB keyboard instead, at least to help you get to the 
point where you can try Tim's suggestion? Of course we'd rather fix the 
problem than work around, but you have to get started...

John