G5 Cannot see other devices in network, despite being hardwired to the AE

I just don't get this.
- My G5 is plugged in via Ethernet to an Airport Extreme.
- I have and Airport Express configured as a repeater and for AirTunes in the living room.
- I have an iPhone and a MacBook.
The following conditions are true and as they should be:
- The G5 receives the internet via the Airport Extreme
- The Macbook receives the internet via the network
- The MacBook can see the File Sharing that the G5 puts out
- The MacBook can see the Airport Extreme and Express with Airport Utility
- The MacBook can use iTunes to connect to the Express for AirTunes
- The iPhone receives the internet over Wi-Fi via this network
- The iPhone can use Remote to control the MacBook's iTunes
The following conditions are true and, given above, make no sense to me at all:
- The G5 cannot see either the Airport Extreme or the Express with Airport Utility
- The G5 cannot use iTunes to connect to the Express for AirTunes
- The G5 cannot see the iPhone/Remote in its list of devices in iTunes
I just flat out don't understand how the G5 can get internet from the Airport Extreme and connect to the MacBook over Wi-Fi via the Airport Extreme, but cannot do anything else that the MacBook can do on this network.
Can someone shed some light on this? I've checked firewall settings and they aren't any different between the G5 and the MacBook.
Please.... I'm just totally confused.
P.S. I've left off the complexity of the Laserwriter, but, I often configure this by adding a small hub between the Airport Extreme and the G5, adding in the Laserwriter via Ethernet to the Hub. The G5 can print to it, the MacBook can print to it, but none of the above changes if I remove the Hub from the network.

I've done some additional troubleshooting and things seem to be related to the G5...
- I tried different users on the G5, same results: G5 cannot see AirTunes or the iPhone, and the Airport Utility doesn't show either Airport Express or Extreme
- I tried putting the MacBook on the Ethernet network, disabling the Airport on it, same results: MacBook can see the Airport Express and Extreme with the Utility, and can see Airtunes and the iPhone
I also tried enabling File Sharing on the MacBook. It takes 7 seconds for the G5 to open a connection the MacBook via AFP file sharing, and it takes two minutes for the MacBook to open a connection to the G5 via AFP file sharing.
I think my next step will be reinstalling the OS on the G5, but I wish I understood why two machines with the same OS on the same network, on the same position on the network, have such a difference in what they can see and what they cannot see.
Does anyone have any insights to share?

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