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I have an older G4 Imac All-In-One, running on OS X 10.3 currently, and I would like to install an airport card. I tried to use a USB wireless connection but am given an error code that the ethernet cable is not connected. Can some one help me hook up the vintage desktop Mac so I can get the internet? Thank You

Here’s how to install an airport card in your machine: http://macs.about.com/gi/dynamic/offsite

updated link towards ifixit guide. Installing iMac G4 15" 700 MHz EMC 1873 AirPort Card