I have an old blue tray load iMac that I just picked up from a school where I do some IT work. I booted it up and couldn't get any networking to work (fresh 10.4.11 install), so I used some 10.4.3 disks to reinstall OS X. I still can't get networking to work, so I did a little more investigation. Ping works with IP addresses and host names, so that rules out DNS problems. Curl and Software Update also don't work, which rules out a problem with Safari. The error I get with Safari is "lost network connection". Any ideas? Is it possible that ping would work perfectly with a "bad" ethernet adapter?