Ok, I just arrived at home and booted my wife's iMac G5, where I have an account. Everything goes fine until I access my account (or any account) and notice that the wired keyboard does not work. For a few seconds I can see a new icon at the dock showing a circle and a key on it before it disappears. It looks a sort of locker but there is no indication of any restrictive access. This is a first for me. Could someone hint what could be happening ? Thanks !