No Internet Access, No IP Address, Cannot "Renew DHCP License"

[macmaximus]

Hello,

All of a sudden, my new iMac G5 has no access to the internet. We have confirmed that the problem does not lie with the ISP, nor with a faulty ethernet cable.

Under Preference>Network, I select Built-In Ethernet>DHCP as usual and the IP address shows up empty. Moreover, the button "Renew DHCP License" is greyed out and I cannot click on it. Another symptom is the much longer time it takes for the iMac to boot up. I am also unable to cross-link the iMac with my PC, which I could do before.

Apple is unable to help me via the phone as I am just outside of the 90 days phone support. Before bringing the iMac into the store where I had purchased it, I am hoping that some expert in here may have a solution?

I suspect that it is a faulty ethernet card?

[hayne]

All of a sudden, my new iMac G5 has no access to the internet. We have confirmed that the problem does not lie with the ISP, nor with a faulty ethernet cable.
What about the device (modem or router) that is at the other end of that Ethernet cable?

Under Preference>Network, I select Built-In Ethernet>DHCP as usual and the IP address shows up empty. Moreover, the button "Renew DHCP License" is greyed out and I cannot click on it.

What does it say when you go to the "Network Status" section of Network preferences?

What version of OS X do you have? (I'm guessing Tiger since it is a new iMac)

Another symptom is the much longer time it takes for the iMac to boot up.

Restart your Mac, then launch the "Console" application (under /Applications/Utilities) and look at the messages that are from around the time of startup. Look for any messages that seem to be reporting problems related to Ethernet or networking. Copy & paste them back here so we can see.

Otherwise, try the standard troubleshooting suggestions:
http://www.apple.com/support/mac101/ (see the "My Mac needs help" section)
http://www.macosxhints.com/article.php?story=2004011205473937
http://forums.osxfaq.com/viewtopic.php?t=7269
http://www.thexlab.com/faqs/faqs.html