What is the procedure to troubleshoot an iBook G4 whose networking has gone deaf?

I have an iBook G4 whose wired and airport card aren’t leasing a dhcp’d IP address. ifconfig shows that neither interface has an ip address. The DHCP server is known to be good and working properly. Physical network cable works fine with another laptop.

Clicking the ‘renew lease’ button in the network pane of System Prefs does not have an effect.

I’m presently trying an ‘archive and install’ of 10.4, but wondered if anyone else had an idea. This issue spontaneously appeared this morning.

Answer

After bringing the iBook home, I’ve found that the Airport card does indeed see my home WiFi network. (Great news)

The wired port is still dead. Network Diagnostics says that it was ‘unable to connect’.

Pinging the loopback worked fine for IPv4 and IPv6.

The firewall was set to allow all traffic (essentially disabled).

ipconfig getpacket for either interface just returned the command prompt.

It’s starting to smell like a hardware issue.

I tried resetting the PRAM just for kicks, but no joy.

I’ve backed-up all of the data via firewire, and I’m going to try a nuke-n-pave to the drive and a clean OS install to see if that helps.

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