I'm running OS X 10.4.11 on an iMac 24". I recently used Onyx to clear some HD space and since then the external speakers won't work. The internal speaker is fine and the externals are live and working (I've tried them on another m/c). When I look at System Preferences > Sound there is only an Internal Speakers option (I'm sure there was an external option previously). Has something been deleted? If so can anyone tel me what and if I can restore it or download it? Thanks