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Thanks for your responses. I did all of the troubleshooting suggested. The problem is not with my user account. I have read how to install an AirPort card. Would it be ok for me to open the imac myself and see if the card or wiring is not in place?

This imac connects to our in-home network and establishes its TCP/IP info. The connection holds for not quite 1 minute and then drops. (The AirPort Status in the menu bar drops from full bars to one, and Safari stops dead.) If I turn AirPort off and then on, the connection re-establishes and...

I recently installed the security update 2008. After a restart, things were a mess. The icon to connect to the internet via my external dial up modem disappeared. When I opened Network in System Preferences, I got a repeated message "Another application has changed your network settings." After...