Can see wireless network, can't connect. HELP!

I have an iMac 1GHz PowerPC G4 running 10.3.1 that I just installed an AirPort card into. I can see my wirless network, but I cannot connect to it. The password is correct, but I keep getting the error "There was an error joining the selected AirPort Network". Please help!

I'm not positive on this, but it might be a encryption compatibility problem between your network and your AirPort Card.  I believe that OS 10.3.x is only capable of the basic encryption WEP, and not the the more modern encryptions WPA and WPA2.  I also think if you upgrade to 10.3.9, that might help get you into WPA encrpytion but it still not up to WPA2 that many modern networks now use.  Then there is 40 bit and 128 bit encryption, and I can't help you there with that.
There are two iMacs with a G4 1Ghz chip, the 15" model M9285LL/A or the 17" model M8935LL/A.  Both of these are AirPort Extreme ready.  Did you use an AirPort card or an AirPort Extreme card?  Perhaps this might be a conflict.
There are WiFi protocols like  IEEE 802.11a/b/g/n (with each letter signifying a different protocol).  I'm pretty sure the original AirPort card on worked on IEEE 802.11a/b.  That might be a problem.
I have an old Tangerine iBook running 10.2.8, that I can't use anymore on WiFi because it couldn't handle the encryption. 
I hope some of these might be helpful.
Good luck.

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