Brand new 20" iMac won't recognize Ethernet cable - can't get online

I just got my iMac and cannot get the ethernet cable to recgonize. I know it works b/c I'm using it this very moment to type this on my Powerbook. When I plug it into the PB, I get the yellow,then the green once it connects. However, when I plug it into the iMac, I get nothing. I thought maybe I needed to configure Built-In Ethernet, but it won't let me select configure or connect. The assistant won't recognize it either. I posted in the Tiger forum mistakenly, but thought this forum would be more appropriate. This is what I posted (for more detail):
I just unboxed my new iMac and can't get on the internet (I'm on my powerbook). The problem is this; in Network, it says "The cable for Built-In Ethernet is not plugged in." Only, it is. Can't be the cable b/c that's the cable I'm connected with right now. So, I go through "assist me" and when I click on "Assistant" it takes me to the Intro page where I'm supposed to give a Location Name. I do this, calling it "home." The ver next screen, after clicking "continue" takes me to "How do you connect to the internet?" The problem here is that, of the 5 options, only one is selectable. Airport is the only one that can be selected?? "I use a telephone modem to dial my ISP" as well as "DSL Modem/Cable/Lan" are all greyed out..they cannot be selected. I use an ethernet cable. Why is this not able to be selected? It's very frustrating. I've turned off Airport and Bluetooth, yet I still cannot check any of these. I need to check "I use a cable modem to dial my ISP" but I can't b/c it won't allow me. Can anyone help me here? I can't use my brand new iMac and it's kind of a bummer. I thought these things were plug and play? Thank

Well I tried that and nothing. I'm completely stumped. I have no idea why this is happening. And it's weird b/c, everytime I'm jumping back on here, I'm just unhooking the ethernet cable from the iMac and plugging it into my PB. And, nearly immediately, i'm up and running, connected with the PB. How can it work on the PB and not on the iMac? And why would those options be grayed out on the iMac? It's like it just refuses to let me check them and/or configure. That is very weird.

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Help! New iMac won't recognize ethernet cable and can't check it

I just unboxed my new iMac and can't get on the internet (I'm on my powerbook). The problem is this; in Network, it says "The cable for Built-In Ethernet is not plugged in." Only, it is. Can't be the cable b/c that's the cable I'm connected with right now. So, I go through "assist me" and when I click on "Assistant" it takes me to the Intro page where I'm supposed to give a Location Name. I do this, calling it "home." The ver next screen, after clicking "continue" takes me to "How do you connect to the internet?" The problem here is that, of the 5 options, only one is selectable. Airport is the only one that can be selected?? "I use a telephone modem to dial my ISP" as well as "DSL Modem/Cable/Lan" are all greyed out..they cannot be selected. I use an ethernet cable. Why is this not able to be selected? It's very frustrating. I've turned off Airport and Bluetooth, yet I still cannot check any of these. I need to check "I use a cable modem to dial my ISP" but I can't b/c it won't allow me. Can anyone help me here? I can't use my brand new iMac and it's kind of a bummer. I thought these things were plug and play? Thanks.

I went and checked logs. Now, I'm not exactly sure what it means, but this is what it shows in the console.log:
Mac OS X Version 10.4.10 (Build 8R2218)
2007-09-28 08:15:33 _0400
2007-09-28 08:15:34 SytemUIServier [80] lang is:en
Sep 28 08:15:43 cory/System/Lybrary/CoreServices/mcxd.app/Contents/MacOS/mcxd:
MCXD.initializeDirectoryServices: Unabe to get the ethernet address
So, I'm curious about that last line. I'm completely stumped. I'm going to have to call apple care. I plan to speak with my IT guy who installed my SW to see if there's any pref's or something that my agency puts on the agency computers that would maybe be doing this. He said he'd be doing a "build" on my machine so that I had that same software I have at work, so I could work from home. Don't know how that could cancel out my ability to select Ethernet in my Network Port Configurations, but who knows.
I'm just bummed I have a new computer and can't get it up and running.

Laptop Won't Recognize Ethernet Cable

Hi,
I'm having an issue with my HP laptop Product # A9Q25AV - One day I got on to play an online game and my computer would not recognize my ethernet cable. I went to device manager to see if there was an issue and I only found my wireless driver. I went to the HP website to download all the Network drivers and it never shows up on device manager after installation and still does not recognizee my ethernet cable. Please Help!
Thanks

jsteele5 wrote:
Usually there is a light that comes on when I plug my ethernet cable into my laptop but it won't trigger the light either. I have plugged the router up to a different computer and my Xbox and it works that way. But once I plug it into my laptop, there is nothing. The WiFi will pick up just fine, I would just rather have an ethernet connection.
Hi Good day! In relation to your issue, you have mentioned that you have already re-installed your network drivers moreover the wireless on your notebook is able to connect perfectly fine. Lastly if I got you correctly the ethernet you're using on this computer is the same ethernet you use for your xbox and its able to connect. Considering your input, it is most likely that the adapter for your LAN/Ethernet is disabled. How to fix the issue? 1. Disable wireless by pressing F12 key on your keyboard.2. Go to Network and Sharing Center and choose change adapter settings (located on the left part of the window)3. From there you will see your LAN/Ethernet Adapter and Wireless Adapter4. Right click on wireless adapter and choose disable on the selection5. Thereafter check Lan Adapter and make sure it's enabled Note: If your ISP is using Cable Technology (ex. Comcast, TWC etc.) You might need to do the "Sequential Powercycling" How to do Sequential Powercycling? 1. Turn off your Modem by unplugging the power cord together with your router (if there is any)2. Shut down your computer totally 3. Wait for one full minute, thereafter turn on only the Modem and wait for the Online light to be solid green4. As soon as the online light on your Modem is light up, turn on your router (if there's any)5. After 1 minute turn on your computer and from there it should be able to connect. I hope this fixes the problem your having, otherwise reply with the result of the troubleshooting I provided so I can do you a follow up! Have a great day! Regards,Marc

Macbook Pro (Lion) won't recognize Ethernet cable

Hi
I'm using a Macbook Pro (15 inch, Early 2011, Built-in OS X Lion 10.7.5)
Normally I connect over Wi-Fi and I have no problem. I used to connect via Ethernet (Cat6 cable) sometimes when I was at work and I had no problem back then ( I didn't have to change any settings).
Recently I had to connect via Ethernet in a facility that used old networking systems and I had to adjust all the proxies and IP settings manually. I had serious problems connecting with LAN eventhough all the settings and proxies were set correctly and other computers on windows were able to connect easily. I even tried to connect by restarting to Windowns 7 in bootcamp but it didn't help. The cable was a cat4 I think and after a while I noticed that in System Preferences>Network>Ethernet the cable in continuously getting connected and disconnected ( Green & Red). The IT-man there couldn't give me any advice beyond that my Network adaptor has problems or cat4 is responsible. After a while I found out if I set the configuration to Manually and set the speed in Ethernet>Advanced>Hardware>Speed to 10baseT/UTP I'll get rid of the disconnecting problem and the connection works without problem.
When I got back from that center to my original workplace I set all the settings to the original automatic setting and connected the Ethernet cable (Cat6) and at first the cable was detected (Green) but the IP address was wrong and I couldn't connect to internet. I disconnected/connected the cable 2 or 3 times and after that the Ethernet was not even connecting or detecting the cable and I had the message "Cable Unplugged". The IT team at the center couldn't help me either and the problem remained even in Windows 7 over Bootcamp.
I came to home and tried to connect with a 5e Ethernet cable to my Linksys router ( that I normally connect via Wi-Fi). But the same problem: Cable unplugged. While my brother was able to connect with the same cable with a Windows 7 based VAIO.
I tried to connect with the Ethernet cable to my brother's laptop and it gets connected and obtains an IP Address.
I tried to change the speed and duplex setting to 1000base, 100base, 10base and half and full but neither of these helped and still I get the message "Cable Unplugged" when trying to connect to router.
In system information I don't see a problem with Ethernet card and the information is as follows:
Name:          ethernet
Type:          Ethernet Controller
Bus:          PCI
Vendor ID:          0x14e4
Device ID:          0x16b4
Subsystem Vendor ID:          0x14e4
Subsystem ID:          0x16b4
Revision ID:          0x0010
Link Width:          x1
BSD name:          en0
Kext name:          AppleBCM5701Ethernet.kext
Firmware version:          57765-v1.37, 0x7287af41
Location:          /System/Library/Extensions/IONetworkingFamily.kext/Contents/PlugIns/AppleB CM5701Ethernet.kext
mDNS offload capable:          3c:07:54:07:d0:d4
Version:          3.2.4b8
So I'm having the problem in different settings, with different routers and in both Mac and Winsows. I have done restarts, shutsowns, PRAM SMC resets and none helped ( neither for the ethernet problem and nor for volume and sleep problems I'm experiencing) so I'm considering reinstalling my OS X Lion. But I'm afraid it is a hardware issue because power fluctuations or something.
I appreciate any suggestion.
PS:
1.My MBP has experienced a falling down but I had no specific problem that I can relate to the strike. Also I had no problems with Ethernet after that.
2.I have a faulty Magsafe adaptor that has a corroded cable but it keeps charging and I'm waiting for my new Magsafe adaptor.
3.Newly I have a weak maximum volume on my Mac and volume fluctuations, also some weird sleep behaviours and delays in sleep.

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Brand new 27" iMac won't turn on anymore.

I bought this computer new on Friday last week. I only got it back from a data transfer yesterday.
Everything was fine until my screen grayed out and said I have to shut down the computer. I shut it down and now it won'tturn back on. I can here the hard drive and fan spin but there is nothing happening on the monitor.
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If the plug is flush inside the back of the machine, and the power outlet you have it connected to works for a lamp, you have a lemon. Bring it back for an exchange.

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Howdy y'all
just got this Macbook pro 13" less than a week ago... I was getting ready to record a song, plug in my headphones... the sound continues to play through the internal speakers... this is SO frustrating.
this macbook pro replaced an ol 15" black macbook which had problems with the headphone jack also (red light coming out of the port)
someone please tell me how to fix this. i've tried several of the "fixes" seen on this board, nothing worked. doesn't even show when i pull up system preferences.
Apple, this is seriously unacceptable
what are we paying 1,500$ for?!?!?!?

Have you tested to determine if the headphones are functional?
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Imac won't detect ethernet cable or firewire connections,

I've also run the prescribed Hardware test which freezes at 2m07sec

If you have not already, I would reset PRAM
http://support.apple.com/kb/HT1379
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Can i use a brand new macbook pro without internet connection? I can't get through the setup without specifying internet.

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This may seem a little strange in a www organised world, but he only wants to use the macbook for storing photos and music.
Is there something we overlooked, or is internet connection a must?
Thx

There should be a place to select "Other network options" or some such wording, where you can select "This Mac does not connect to the internet."

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Go into the network preference pane and click on the settings button and click "Set Service Order". Drag ethernet to the top and save all your settings.

IMac will not connect to Wifi or recognize Ethernet cable

I have an iMac running on OS X. All of a sudden I cannot connect to WiFi...and the computer will not recognize an ethernet cable plugged in. It's wierd...the Wifi will recognize networks in the area. I'll see mine, click on it and it'll ask for the password. I put in the password and it says it's incorrect (The password is defiitely correct as I have several other devices hooked up via Wifi). It wont recognize an Ethernet cable pugged in. It just says one isnt plugged in.
I did aquire a new modem/router recently (Ubee from Time Warner Cable) but no other device is having any issues...including a brand new 27" iMac...among several other devices working fine on the WiFi.
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First I would try Safe boot.
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I'm trying to burn photos onto a CD from Finder, but my iMac won't recognize either a CD-R or a DVD-R.

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Create a new folder. Place the photos in that.
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Disconnect all your peripherals, reset the PRAM
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My menu bar does not appear at the top of my homepage on a brand new 27" iMac only when i pull up an app. this does not allow me to shut down my mac when all apps are closed nor does it all me to use finder. any help would be awesome

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Brand new 20" iMac won't recognize Ethernet cable - can't get online

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