How to connect to the internet using ethernet

I have an iMac 10,1 and am unable to connect it to the internet using an ethernet cable.
I have a more recent Mac Book and I just plugged in the ethernet cable to it, clicked the setting in Network settings, and I was connected.
On the iMac it keeps saying, diagnostics can't fix it etc..?
On the left panel in Diagnostics, Ethernet has a green light, Network Settings an orange light, and ISP a green light (internet and Server are Red).
I'm using Comcast cable, and they just say the settings should appear automatically on a Mac (which they apparently did on my Mac Book!)
Any suggestions, appreciated.
Alan.

From the menu bar, select
           ▹ System Preferences... ▹ Network ▹ Advanced ▹ TCP/IP
What values are shown for the following?
          Configure IPv4
          IPv4 Address
          Subnet Mask
          Router

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Turn off the computer, router, and modem. Wait at least one minute. First, turn on the modem and wait until the status lights indicate connection to your ISP. Second, turn on the router and wait until the status light shows communication with the modem. Last, turn on the computer.
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If you are having an issue with the Ethernet connection on your MacBook Pro, you may find the following article helpful:
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http://support.apple.com/kb/TS1317
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Macbook Pro suddenly will not connect to the internet via ethernet cable.

I know this is a long shot... but I figured I would give it a try.
My macbook pro suddenly does not connect to the internet via ethernet cable. Please bear with me, as I am not very tech-savvy - I will try my best to describe the symptoms!
I connect to the internet via ethernet (we don't have wifi). It was working before I went to work, and when I came home I suddenly couldn't get anything to work (I know everyone says this, but I truly didn't mess with anything). Internet browsers just think for awhile and then turn up the 'You are not connected to the internet' error.
I went into my network preferences and curiously, the 'Ethernet' shows a green dot and says 'connected'. However it says 'Authentication server is not responding' underneath the last part that says '802.1X: WPA: eduroam' (I think that is my user profile).
When I go into my 'security' settings I can see that my firewall is off, so that shouldn't be causing any problems.
I've tried restarting the router and computer itself many times. Diagnostics just gets to a certain point and reports back 'Network Diagnostics cannot fix the current networking problems.' I've also tried switching to a different ethernet cable, and I tried both cables out on a PC laptop and it connected without issue. Additionally, I brought my macbook along to a friend's house and it connected to his wifi just fine, so the problem appears to just be with ethernet connections.
I know it's hard to troubleshoot this kind of thing without being there and having a look at the computer yourself, but any tips wouild be greatly appreciated.

As I mentioned above, I am not very tech savvy so I have no idea why a wireless protocol would be showing up there, I'm just listing everything I see in hopes that someone might know something I can try. This is why I am asking for help here - I'm not sure what has happened that has made me unable to connect, especially since it seemingly occured while nobody was using the computer.
I guess I should clarify that I'm not a total hillbilly- normally my firewall is set to 'on', but I set it to 'off' to try and troubleshoot the issues here as I was told that sometimes it can interfere with the computer's ability to connect to the internet. If this is not the case and firewall does not affect anything, I will turn it back on while I try to fix this.
I have tried the method you mentioned above a few times - I actually contacted my ISP earlier this week and they recommended resetting the router like that. They didn't mention any known network issues.

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The PC Repair Guy,
If you haven't already, verify that you can connect to the internet through some other means such as Wi-Fi or Ethernet with your laptop to rule out any network setting issues. If you are able to connect successfully to the internet, use that opportunity
to make sure you have
Windows 8.1 Update installed as well as any other applicable updates your laptop may require.
You may also want to check the
Windows Compatibility Center to make sure that your device is compatible with Windows 8.1.
Another possibility is that the driver your laptop is installing for the device isn't the correct one. Check the device manufacturer's site for the most up to date driver they have available for Windows 8.1.
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Try the following, in order, until resolved:
1. If the modem has a reset switch, use it to reset the modem. Wait at least 5-10 minutes for the modem to initialize.
2. Remove power from the modem. If it has a backup battery, remove this as well. Wait 5-10 minutes. Replace the battery, and add power back to the modem.
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o Power-on the modem; Wait at least 5 minutes.
o Power-on the AEBS; Wait at least 5 minutes.
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Modem/Router Power ReCycling - Full
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o Power-on the modem; Wait at least 15 minutes.
o Power-on the AEBS; Wait at least 5 minutes.
o Power-on the computer(s)
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I tried to update my browser from 3.6 to4.0. On restarting the computer I found I could no longer connect to the internet. I then connected to the internet using Internet Explorer and removed the mozilla browser and reinstall Mozilla firefox 4.0. Again the browser using this updated version didn't work. So reinstalled Mozilla firefox 3.6 and it worked.
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Take each of the following steps that you haven't already tried, until the problem is resolved.
Step 1
Restart the router. Many problems are solved that way.
Step 2
Change the name of the wireless network, if applicable, to eliminate any characters other than letters and digits. You do that on your router via its web page, if it's not an Apple device, or via AirPort Utility, if it is an Apple device.
Step 3
Run the Network Diagnostics assistant.
Step 4
Back up all data.
Launch the Keychain Access application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Keychain Access in the icon grid.
Enter the name of your wireless network in the search box. You should have one or more "AirPort network password" items with that name. Make a note of the name and password, then delete all the items. Quit Keychain Access. Turn Wi-Fi off and then back on. Reconnect to the network.
Step 5
You may need to change other settings on the router. See the guidelines linked below:
Recommended settings for Wi-Fi routers and access points
Potential sources of interference
Step 6
Make a note of all your settings for Wi-Fi in the Network preference pane, then delete the connection from the connection list and recreate it with the same settings. You do this by clicking the plus-sign icon below the connection list, and selecting Wi-Fi as the interface in the sheet that opens. Select Join other network from the Network Name menu, then select your network. Enter the password when prompted and save it in the keychain.
Step 7
Reset the System Management Controller (SMC).

Connected to the internet via ethernet, BUT...

I turned off my computer, modem, everything and uplugged it all because of a severe lightning storm Saturday. Since I turned it back on the next day I haven't been able to access the web or my mail. However, the problem must be with my G4, because I have an iBook on Airport and I'm able to connect to the web and email with it. So the cable modem and Airport are evidently working properly. My G4 network settings all appear normal. I've got a green light saying I am connected to the internet via ethernet, but I'm really not. My email won't go online and no browser works, although I don't get a "can't connect" message on the browser screen, it just stays white. I had this problem before but I can't remember what I did to correct it. I just remember unplugging the modem and Airport over and over, in different order, and resetting preferences. But I don't remember what I did, if anything, to actually make it work again. Does anyone have an idea on what I can try to REALLY connect?
Thanks in advance for your help.
Frustrated in Florida,
EG

Tough to troubleshoot lightning in person, moreso at a distance!
Things to try...
Type 17.112.152.32 into your browser... thinking it may be off looking for a DNS server that doesn't exist.
Launch Network Utility and see if you can Ping like that addy, or your other computer.
Results may help us get further.

How to connect to the internet using ethernet

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