Help needed in connecting a Mac Mini to AT&T DSL

Any suggestions on how to troubleshoot this problem will be appreciated. I'm helping a friend connect a Mac to the Internet using AT&T DSL. The computer is a Mac Mini, 1.42 GHz PPC G4, running OS X 10.5. It is connected by Ethernet to an AT&T DSL modem. The Mini's Network preference is configured to connect using DHCP.
Strange symptoms include:
1. Safari will not connect to the Internet.
2. However, Firefox WILL connect and loads all websites I tried.
3. Apple Mail will connect and download messages from my friend's previous email address (not AT&T), but will not connect to allow me to configure his new AT&T account.
4. Other programs that need a network connection won't run; for example, the Software Update preference, when checking for new updates, claims that there is no network connection.
Do these symptoms indicate that the Mini's network preferences are not configured correctly, or that the DSL modem is not configured correctly?
More information: with the modem is an "Installation Wizard Disc" CD with a setup program. It's supposed to work for any PPC G3 or greater Mac, which certainly fits this Mini. BUT, when run on the Mini, the setup program displays a message that the computer's processor is "unrecognized". Then the setup program quits. I ran the setup program on my MacBook Pro laptop connected to the DSL modem. It went through a lengthy process with messages about "configuring the modem". After this, I was able to connect to the Internet with Safari using the laptop. This seems to indicated that there's nothing basically wrong with the modem or DSL connection. However, I can't run the setup program on the Mini. (The above symptoms were after getting the laptop to work, then switching the Ethernet connection back to the Mini.)

This is a strange problem, especially since Firefox is working OK.
You might try using OpenDNS. They have a good set of instructions about how to do this here:
https://www.opendns.com/start
It's possible that AT&T's DNS servers aren't responding fast enough, and Safari is timing out quicker than Firefox.
The other option is to call AT&T and ask for support in accessing their DSL modem.
A third option would be to download a system maintenance utility like Yasu
http://jimmitchell.org/projects/yasu/
and use it to clear all the caches in the system -- in case the Mini somehow is using stale information about the net.

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