hi, i have recently bought an IMAC G5 running tiger 10.4.1 and i am having problems with the firewall. when i go to check the settings in system prefs/sharing, and i select 'firewall' i get the message 'other firewall software is running on your computer. to change the apple firewall settings, turn off the other firewall software'. i have not installed any other firewall, so i have no idea what is causing this. i have tried deleting 'com.apple.sharing.firewall.plist' from library/preferences folder and restarting, but this hasn't solved the problem. does anyone have any idea what i could try next ? thanks nick.