Mac mini won't connect to internet?

My husband has a mac mini running on 10.3.7 that he got from a friend, we have a verizon wireless jetpack, and it works fine on my MacBook Air to connect to the internet. The jetpack also works fine with the ipad & iphone. He just got an iphone and wants to connect it to his mac mini so he can get his itunes and other info on the phone. Every time we try to connect to the internet with the mini, the Verizon jetpack shows up on the ethernet, we enter the correct password as prompted, and either get some sort of 'password is not correct', or 'error' message. (It's the same exact correct password that's worked with my other devices)

We need to get online to update the horribly out of date system & get his phone set up with photos & music too. The mini is a power pc G4. We've tried just about everything I can think of to connect. I'm not mac-retarded, but this one seems to be out of my scope of knowledge.

I've already searched google for a good hour, and hit up the mac forums with no luck.

Any help would be greatly appreciated.
Maybe some computer genius can tell us what might be wrong.

To join a WPA network, a Macintosh computer must have:
* an AirPort or AirPort Extreme card, or compatible third-party card.
* Mac OS X 10.3 or later.
* AirPort software version 3.3 or later for the AirPort Card (available via Software Update).
* AirPort software version 3.2 or later for the AirPort Extreme Card (available via Software Update).

BTW, this computer is SEVEN YEARS OLD, yet no updates have ever been applied. Why did you turn off the automatic updates? Don't tell me this computer has not been online for the entire seven years.

Do this…
-- Disconnect the ethernet cable from the Wi-Fi router.
-- Connect the ethernet to the Mac Mini.
-- Unplug the power from the service provider's ADSL box, wait 40 seconds, plug it in again.
-- Wait 40 more seconds, and open Software Update.
-- Accept all updates, install, restart.
-- Open Software Update AGAIN. (Yes, it will find more.)
-- Keep installing updates and restarting until it shows "Software is up to date".

That will make the OS 10.3.9 and AirPort will be updated.

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