Can't connect via Built-in ethernet

Can connect to internet via AirPort, but not by Built-in Ethernet. Network status says "The cable for the Built-in Ethernet is not plugged in". BUT it is and it is live because I have plugged it into another computer and it works fine. How do I check out the MAC hardware. Modem light for LAN Ethernet is on and blinks when cable is connected to the MAC. When I do the network diagnostics, there is a red light for the Built-in Ethernet.

Hi K8TW, and a warm welcome to the forums!
While you may get help or a solution here, It's quite acceptable to start a new topic of your own, certainly feel free to start a new topic to attract more helpers to your particular situation, here's a link if as is often the case, it's hard to find out where to do it...
http://discussions.apple.com/post!default.jspa?forumID=755
If you do you might include this info...
At the Apple Icon at top left>About this Mac.
Then click on More Info>Network, then highlight Built-in Ethernet & paste this info...
Built-in Ethernet:
Type: Ethernet
Hardware: Ethernet
BSD Device Name: en0
IPv4 Addresses: 10.0.1.11
IPv4:
Addresses: 10.0.1.11
Configuration Method: Manual
Router: 10.0.1.12
Subnet Masks: 255.255.255.0
Proxies:
Proxy Configuration Method: Manual
ExcludeSimpleHostnames: 0
FTP Passive Mode: Yes
Auto Discovery Enabled: No
Ethernet:
MAC Address: 09:c6:cb:3f:ad:55
Media Options:
Media Subtype: autoselect

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Hello,
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Hi Steve, and a warm welcome to the forums!
Safe Boot , (holding Shift key down at bootup), use Disk Utility from there to Repair Permissions, move these files to the Desktop.
/Users/YourUserName/Library/Preferences/ByHost/com.apple.networkConnect.<12 digit number>.plist
/Users/YourUserName/Library/Preferences/com.apple.internetconnect.plist
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/Users/YourUserName/Library/Preferences/com.apple.systempreferences.plist
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Hello,
I'm running into a frustrating problem and hoping someone can help.
I have a new MacBook Pro that won't connect via Ethernet. My old computer (Powerbook G4) with the same settings works flawlessly.
Details: under Network Settings I have Automatic/Using DHCP. When I click on Assist Me>Diagnostics, I get green lights all the way down (Built-In Ethernet, Network Settings, ISP, Internet, Server). The Diagnostics tool therefore proudly announces that my Internet connection is working correctly.
When I open Safari, however, it won't open any page. Using Ping I also get no responses.
When I plug the exact same ethernet cable into my Powerbook G4, everything works flawlessly. The only difference is that the IP address ends in .25 instead of .30 (I assume that's from the router assigning different IP addresses to the two computers.)
On another forum i read about someone having a problem with a long/lossy ethernet cable, but I just took my computer to the router and tried with a 2-foot ethernet cable. Same situation.
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Thanks

i rebooted the firewall and it worked.

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We have a small office network connected to an Efficient Networks DSL router that's managed by our isp. The router has 4 ports and a linksys 8 port switch is connected to one of those ports. Another D-Link wireless router/switch is connected to another port.
2 i-macs connect without problem via ethernet cable. They are set to DHCP and get 192.xx private addresses. Both run 10.4.5. Another older imac running 9.2.2. also has no problems.
I recently purchased a powerbook G4 and it will not connect via ethernet to the Efficient networks router. At first it was connected to the linksys, so decided to connect it direct to the Efficient Networks router. With DHCP, it acquires a 169. internet address which is self generated (i.e. no real connection). I tried to give it a static private address (talking to the isp provider). They could see the powerbook but saw all zero's (presumable mac address). By the way the Powerbook works perfectly at home connected via ethernet cable to a D-Link router connected to a cable modem so it's not a physical problem. I even checked the ethernet cable I used in the office with another computer - no problem.
When I switch to airport in the office, the powerbook connects to the network and the internet. I get some strange warning messages showing the server's and the router's private ip addresses. I click ok, and the powerbook finds an unassigned private ip address. It's the only way it will work, but it causes problems, because I can't connect to one of the network printers. Speed also isn't great.
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Tks

Tim,
Thanks for your help. Here's what I've done before reading your e-mail. The D-Link DI-524 wireless router is connected to the Effiicent Neworks DSL router as you mentioned. One ethernet port of the EFF.Net. router is connected to the WAN port of the DI-514.
Because I have a D-Link router at home which works flawlessly with my powerbook, I decided to connect the ethernet cable of the powerbook to the D-Link which has 4 ethernet ports. Lo and behold, the powerbook acquired a private ip address and connected to the LAN and internet!
When I connected the powerbook direct to the Efficient Networks router, it could not communicate. I believe that there must be some software incompatibility between the powerbook and the Efficient Networks router. By connecting to the D-Link, the D-Link assigned an ip address to the powerbook, and it could connect to the server, lan, etc..
Only problem is that I have a Brother network printer that cannot connect to the powerbook. My powerbook cannot find it on the network. Because there is a linksys switch connected to the efficient networks router's third ethernet port, maybe as you said, going through the D-Link via DHCP (when the Linksys is also acting as a DHCP server, might cause this type of problem. What do you think?
As a final note, other imac G5's connected to the linksys switch (which then connects to the Efficient Network's router) have no problem connecting to the lan or internet and have no problem connecting to any of the printers. When I put the powerbook on that switch, I could not connect to the internet - i.e. whether connecting via the lynksys switch or direct with the efficient networks router - same results: no internet connection whether manually or via DHCP.
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I did see a message saying that my network settings had been changed by another application but don't know if this figures in the mix.
Anyone have any ideas how I ought to approach getting the iBook back online?
I think you ran across the security update bug in 10.4.11 the deals with an ethernet connection. Here is the workaround:
http://discussions.apple.com/message.jspa?messageID=8185915#8185915
Here is more of the story:
http://discussions.apple.com/thread.jspa?threadID=1730909&tstart=0

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By the way, I was able to connect to the Internet via Airport or Ethernet with my G4 Powerbook. But I can't do it via Ethernet with the iMac.
What can I do to get this working?
Griff

Problem resolved!
I don't know what the problem was. I just tried again. This time I did not reboot the computer. I shut down the modem, attached the Ethernet cable and fired it up again and this time I was connected!
So I really don't have an answer except that it just decided to start working.
Griff

Can't connect via Built-in ethernet

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