Older iMac not recognizing AirPort card

I manually installed an AirPort Extreme card in my G4 iMac. I followed the instructions exactly. However, it's not showing up anywhere in the Network Preferences. It's like I never installed it. I think I did everything right, I even went back and did it again, still to no avail.
Is there something I'm missing here? Remove screws, plug in card, restart computer, right?
Part of what be my problem is I'm using a newer iMac that does have an AirPort card built-in as a base station, (or, at least, that's the plan- is nothing showing up because I don't have a real base station?). Maybe I'm totally wrong about all this, but I don't think that should stop my computer from not recognizing the card.
It is an older card, bought refurbished from the Apple Online Store.

Which G4 iMac did you install the card into? Does it have a clock speed of 1 GHz or faster? Click on the Apple menu and select "About this Mac".
Assuming the clock speed is 1 GHz or faster, run System Profiler and look in the "AirPort:" field. If the card is not recognized, the field will be blank.

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