Can't connect to Internet via ethernet

I have two brand new 11" MacBook Airs. I can connect to the internet via ethernet on one and not the other. I little back story...
I previously had two 13" MacBook Pros and had the same issue – one could connect to the internet via ethernet and one couldn't. I used migration assistant when I upgraded to the new MBAs, so I believe I carried over a setting from the previous "problem" comuter to the new one. Interestingly, both of my MacBook Pros connected to the internet via ethernet just fine until, for reasons unknown to me, one day one would no longer work.
When I look at diagnostics, the lights are (from top to bottom): green, yellow, green, red, red
Is it possible to revert some ethernet networking setting to factory?
Thanks for any help you may be able to provide.
Caanan

The same thing has happened to me, it just stopped working. No, I've had this problem for a long time with this machine, but the other day I was downloading some large files, and all the files dropped down to nothing, internet was gone.
It will connect to Wireless, but now I'm even having problems with that.
If I plug in the Ethernet cable but set it to use AirPort, it won't find the web. I have to unplug the cable and it will use AirPort -- not good when I need to access hard drives! It had been working with it plugged in, but it just stopped. (I don't know if it was using the Ethernet or the AirPort at the time.) I wasn't messing with any settings at the time.
Tried restarting, running diagnostics, using different browsers, various websites, didn't help.
It's a MacBook 2,1 -- 2.0 GHz, Intel Core 2 Duo -- 10.4.11
I have a G4, same OS, using the same router, same settings, everything. G4 works perfectly.

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To make this easier to type Macbook Pro = MBP
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I think a clue to what is happenning is the 169.xxx.xxx.xxx IP addresses.
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Try using a different USB port. Several people are having problems with the single port on the right.
I would not expect a compatability issue with your ISP. After all you only need a telephone number and usrid/password and the prtocols are standard.

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I have an iMac that is directly wired to an airport base station and a G4 powerbook that connects via a card. Neither can connect to the internet. The iMac is set up as follows:
Cable modem > ethernet cable to WAN port on AEBS > ethernet cable from AEBS to iMac.
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I am completely confused as to what is going on. Can anyone please help?

If it helps any, I'm in the same boat. I've had an AEBS that has worked well until yesterday. Now, my Powerbook can't connect to the internet via wireless or ethernet (connected directly to the AEBS). My POwerbook CAN talk to my networked HD. To make things worse, my two Tivos (connected to the network via an Airport Express & WDS) CAN connect to the internet.
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Thanks again, I tried that but it didn't work either. Going back to basics, it might help if I tried to set out what I'm trying to take in a bit more detail:
1. Having just moved house I have a new ADSL line and modem installed by the phone company and a new ISP that has provided me with a username and a password. Using those I have no trouble getting internet via an ethernet cable connecting my iBook and the Modem.
2. I plug the ethernet cable into my AX and then plug the AX into the wall.
3. Then I follow the AX set up assistant guide for setting up a new base station.
4. I click the box for DSL or Cable Modem. I don't click the box for Router
5. This is the step I'm most unsure about. Because it is the default option I click the box for DSL or Cable modem ... or over Ethernet with an IP address assigned automatically using DHCP." I do not tick "I do not use DHCP". But I don't really know what that means.
6. AX tells me that it is configured as follows: TCP/IP: using DHCP and IP Address: Provided automatically.
7. When I open Safari it tells me that I'm not connected to the internet. Clicking the network diagnistics box gives me green lights for everything up to and including ISP but not for the internet.
Someone here mentioned that I might have to reconfigure my modem as a router. Is there anything to that?
Thanks again for your help.

Can't connect to Internet via ethernet

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