Ethernet cable not recognised?
My wife's MacBook Pro connects to our home network via Airport with no problem, but when we switch off wi-Fi and plug in the Ethernet cable it doesn't connect. Network diagnostics says that the Ethernet cable is unplugged and System Profiler says there is no Ethernet PCI installed!
Any suggestions as how to sort this?
I assume nothing not in evidence. If you've tried something and it didn't work, mention it and effort can be directed to things not tried. I don't use wireless modems, so I have no idea how your network is setup. On mine, the cable modem hooks to a router and I can bypass the router. If you have a separate wired modem, bypass the Airport. If not, wait until someone else pops in.
Similar Messages
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Internet via ethernet cable not recognised: just wireless
Hi -
I have an ethernet cable that supplies my internet, but Windows Vista (Home Premium) will only let me access a Wireless connection (of which I don't have one!).
Can anybody help?
Thanks!anch66,
Could you please provide a little more information. Who is your Internet Service Provider (ISP) and what are their minimum system requirements?
Our G3 that connected to the web for years with OS 8.1 no longer connects because we changed providers. Juno requires OS X to load pages. We can connect to the server with the right settings but then it does nothing to load a page because the minimum OS requirements are not met.
Gmail is similar. It requires OS X to set up an account. I had my son set up the account on his G5 and then we could access it with OS 8.1 on the G3. The devil is in the details.
Do you have a second hard drive or a partition on your drive to give you a backup if the upgrade does not go well. Buying an install CD would give you a little better upgrade path.
Ji˜m -
Ethernet cable not plugged in? But it's right there!
My MacBook Pro is insisting that the ethernet cable isn't plugged in. Now, I know the cable is good and the port on the switch is good because they work with my network printer. If I create a new location in Network Preferences (as suggested here http://ryanshelloworld.blogspot.com/2009/03/ethernet-cable-not-plugged-in.html) it works, but only at 10 Mbps (rather than gigabit) and when I unplug the cable and plug it back in it loses it again.
Any ideas on what to do next?Try a new cable. Although it works on another device Macs are picky about the quality of the line.
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"Ethernet Cable Not Connected" Huh?
I have a dual 10.3 450 G4 that I rarely connect to the internet. I kept getting the wrong date and time so I changed the battery. Now the monitor display keeps resetting to the wrong size and I keep getting the message the "Ethernet Cable not connected even though if I connect the cable to my laptop it works fine. I even tried restarting in OS 9, I repaired permissions still nothing. The system profiler tells me that the the extension is not loading. I can't find where to dump the preferences.
Any help?
Thanks
EnioHi,
Try re-setting the PRAM.
http://docs.info.apple.com/article.html?artnum=2238
or, PMU Reset
http://docs.info.apple.com/article.html?artnum=95037
Regards,
Dave -
Thunderbolt Ethernet bridge not recognised
I have an original Apple Thunderbolt Ethernet bridge (TEB) for my brand new MBP 13" retina Mid 2014 edition and I am running Yosemite 10.10.2. I connect to the internet via ethernet regularly to play online video games. I recently plugged in my TEB and found that it wasn't connecting me to the internet. I checked network preferences and tried to run diagnostics but in the network preferences it says there is nothing plugged into the Thunderbolt port. However, when I go to system information and under the hardware tab I selected Thunderbolt, with the TEB connected there is a little drop down menu named Thunderbolt bus and under it it says Thunderbolt to Gigabit Ethernet Adapter. If I remove the TEB, this drop down option is not there, which gives me the impression that the computer is recognising the TEB, but somehow something is wrong with the software that isn't allowing me to connect.
Further information before any of you suggest something simple because I've tried all the simple solutions
I went to the apple store with my TEB and asked them to check if it was working, they confirmed that there is nothing wrong.
I've also used a brand new ethernet cable, one that I know is working to connect to the modem. And obviously my internet is working because otherwise I wouldnt be writing this.
So if anyone knows what I can do to fix this problem please help!
I've used the app EtreCheck and here were the results, doesn't seem like anything is wrong
Problem description:
Thunderbolt Ethernet bridge not working to connect to internet
EtreCheck version: 2.1.8 (121)
Report generated 28 Mar 2015 12:46:55 CET
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
MacBook Pro (Retina, 13-inch, Mid 2014) (Technical Specifications)
MacBook Pro - model: MacBookPro11,1
1 2.6 GHz Intel Core i5 CPU: 2-core
8 GB RAM Not upgradeable
BANK 0/DIMM0
4 GB DDR3 1600 MHz ok
BANK 1/DIMM0
4 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en0: 802.11 a/b/g/n/ac
Battery Health: Normal - Cycle count 79
Video Information: ℹ️
Intel Iris
Color LCD spdisplays_2560x1600Retina
System Software: ℹ️
OS X 10.10.2 (14C1514) - Time since boot: 1:35:6
Disk Information: ℹ️
APPLE SSD SM0256F disk0 : (251 GB)
EFI (disk0s1) <not mounted> : 210 MB
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
[redacted]'s Mac (disk1) / : 249.78 GB (63.80 GB free)
Encrypted AES-XTS Unlocked
Core Storage: disk0s2 250.14 GB Online
USB Information: ℹ️
Apple Internal Memory Card Reader
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Inc. Apple Internal Keyboard / Trackpad
Logitech USB-PS/2 Optical Mouse
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
Apple Inc. Thunderbolt to Gigabit Ethernet Adapter
Gatekeeper: ℹ️
Mac App Store and identified developers
Launch Agents: ℹ️
[loaded] com.google.keystone.agent.plist [Click for support]
Launch Daemons: ℹ️
[loaded] com.adobe.fpsaud.plist [Click for support]
[loaded] com.google.keystone.daemon.plist [Click for support]
[loaded] com.microsoft.office.licensing.helper.plist [Click for support]
User Launch Agents: ℹ️
[loaded] com.adobe.ARM.[...].plist [Click for support]
[loaded] com.valvesoftware.steamclean.plist [Click for support]
User Login Items: ℹ️
Flux Application (/Applications/Flux.app)
iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Dropbox Application (/Applications/Dropbox.app)
Basis Sync Application (/Applications/Basis Sync.app)
Internet Plug-ins: ℹ️
FlashPlayer-10.6: Version: 17.0.0.134 - SDK 10.6 [Click for support]
QuickTime Plugin: Version: 7.7.3
Flash Player: Version: 17.0.0.134 - SDK 10.6 [Click for support]
Default Browser: Version: 600 - SDK 10.10
o1dbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
SharePointBrowserPlugin: Version: 14.4.8 - SDK 10.6 [Click for support]
googletalkbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
Safari Extensions: ℹ️
AdBlock
3rd Party Preference Panes: ℹ️
Flash Player [Click for support]
Time Machine: ℹ️
Auto backup: YES
Volumes being backed up:
Zimo's Mac: Disk size: 249.78 GB Disk used: 185.98 GB
Destinations:
Backup [Local]
Total size: 200.00 GB
Total number of backups: 4
Oldest backup: 2014-12-29 22:43:52 +0000
Last backup: 2015-02-23 10:08:15 +0000
Size of backup disk: Too small
Backup size 200.00 GB < (Disk used 185.98 GB X 3)
Top Processes by CPU: ℹ️
4% Google Chrome
4% WindowServer
0% fontd
0% AppleSpell
0% hidd
Top Processes by Memory: ℹ️
326 MB com.apple.WebKit.WebContent
215 MB Google Chrome
120 MB mds_stores
120 MB WindowServer
86 MB Finder
Virtual Memory Information: ℹ️
1.02 GB Free RAM
4.60 GB Active RAM
1.94 GB Inactive RAM
1.03 GB Wired RAM
3.38 GB Page-ins
66 KB Page-outs
Diagnostics Information: ℹ️
Mar 28, 2015, 11:11:39 AM Self test - passed
Mar 28, 2015, 10:16:32 AM /Library/Logs/DiagnosticReports/com.apple.WebKit.WebContent_2015-03-28-101632_[ redacted].cpu_resource.diag [Click for details]
Mar 25, 2015, 01:18:58 PM /Library/Logs/DiagnosticReports/iTunes_2015-03-25-131858_[redacted].cpu_resourc e.diag [Click for details]I have an original Apple Thunderbolt Ethernet bridge (TEB) for my brand new MBP 13" retina Mid 2014 edition and I am running Yosemite 10.10.2. I connect to the internet via ethernet regularly to play online video games. I recently plugged in my TEB and found that it wasn't connecting me to the internet. I checked network preferences and tried to run diagnostics but in the network preferences it says there is nothing plugged into the Thunderbolt port. However, when I go to system information and under the hardware tab I selected Thunderbolt, with the TEB connected there is a little drop down menu named Thunderbolt bus and under it it says Thunderbolt to Gigabit Ethernet Adapter. If I remove the TEB, this drop down option is not there, which gives me the impression that the computer is recognising the TEB, but somehow something is wrong with the software that isn't allowing me to connect.
Further information before any of you suggest something simple because I've tried all the simple solutions
I went to the apple store with my TEB and asked them to check if it was working, they confirmed that there is nothing wrong.
I've also used a brand new ethernet cable, one that I know is working to connect to the modem. And obviously my internet is working because otherwise I wouldnt be writing this.
So if anyone knows what I can do to fix this problem please help!
I've used the app EtreCheck and here were the results, doesn't seem like anything is wrong
Problem description:
Thunderbolt Ethernet bridge not working to connect to internet
EtreCheck version: 2.1.8 (121)
Report generated 28 Mar 2015 12:46:55 CET
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
MacBook Pro (Retina, 13-inch, Mid 2014) (Technical Specifications)
MacBook Pro - model: MacBookPro11,1
1 2.6 GHz Intel Core i5 CPU: 2-core
8 GB RAM Not upgradeable
BANK 0/DIMM0
4 GB DDR3 1600 MHz ok
BANK 1/DIMM0
4 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en0: 802.11 a/b/g/n/ac
Battery Health: Normal - Cycle count 79
Video Information: ℹ️
Intel Iris
Color LCD spdisplays_2560x1600Retina
System Software: ℹ️
OS X 10.10.2 (14C1514) - Time since boot: 1:35:6
Disk Information: ℹ️
APPLE SSD SM0256F disk0 : (251 GB)
EFI (disk0s1) <not mounted> : 210 MB
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
[redacted]'s Mac (disk1) / : 249.78 GB (63.80 GB free)
Encrypted AES-XTS Unlocked
Core Storage: disk0s2 250.14 GB Online
USB Information: ℹ️
Apple Internal Memory Card Reader
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Inc. Apple Internal Keyboard / Trackpad
Logitech USB-PS/2 Optical Mouse
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
Apple Inc. Thunderbolt to Gigabit Ethernet Adapter
Gatekeeper: ℹ️
Mac App Store and identified developers
Launch Agents: ℹ️
[loaded] com.google.keystone.agent.plist [Click for support]
Launch Daemons: ℹ️
[loaded] com.adobe.fpsaud.plist [Click for support]
[loaded] com.google.keystone.daemon.plist [Click for support]
[loaded] com.microsoft.office.licensing.helper.plist [Click for support]
User Launch Agents: ℹ️
[loaded] com.adobe.ARM.[...].plist [Click for support]
[loaded] com.valvesoftware.steamclean.plist [Click for support]
User Login Items: ℹ️
Flux Application (/Applications/Flux.app)
iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Dropbox Application (/Applications/Dropbox.app)
Basis Sync Application (/Applications/Basis Sync.app)
Internet Plug-ins: ℹ️
FlashPlayer-10.6: Version: 17.0.0.134 - SDK 10.6 [Click for support]
QuickTime Plugin: Version: 7.7.3
Flash Player: Version: 17.0.0.134 - SDK 10.6 [Click for support]
Default Browser: Version: 600 - SDK 10.10
o1dbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
SharePointBrowserPlugin: Version: 14.4.8 - SDK 10.6 [Click for support]
googletalkbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
Safari Extensions: ℹ️
AdBlock
3rd Party Preference Panes: ℹ️
Flash Player [Click for support]
Time Machine: ℹ️
Auto backup: YES
Volumes being backed up:
Zimo's Mac: Disk size: 249.78 GB Disk used: 185.98 GB
Destinations:
Backup [Local]
Total size: 200.00 GB
Total number of backups: 4
Oldest backup: 2014-12-29 22:43:52 +0000
Last backup: 2015-02-23 10:08:15 +0000
Size of backup disk: Too small
Backup size 200.00 GB < (Disk used 185.98 GB X 3)
Top Processes by CPU: ℹ️
4% Google Chrome
4% WindowServer
0% fontd
0% AppleSpell
0% hidd
Top Processes by Memory: ℹ️
326 MB com.apple.WebKit.WebContent
215 MB Google Chrome
120 MB mds_stores
120 MB WindowServer
86 MB Finder
Virtual Memory Information: ℹ️
1.02 GB Free RAM
4.60 GB Active RAM
1.94 GB Inactive RAM
1.03 GB Wired RAM
3.38 GB Page-ins
66 KB Page-outs
Diagnostics Information: ℹ️
Mar 28, 2015, 11:11:39 AM Self test - passed
Mar 28, 2015, 10:16:32 AM /Library/Logs/DiagnosticReports/com.apple.WebKit.WebContent_2015-03-28-101632_[ redacted].cpu_resource.diag [Click for details]
Mar 25, 2015, 01:18:58 PM /Library/Logs/DiagnosticReports/iTunes_2015-03-25-131858_[redacted].cpu_resourc e.diag [Click for details] -
My 2-year-old Airport Extreme instantly stopped working last night and is flashing the status light. The problem description is that the ethernet cable is not plugged in... however, the ethernet cable is still plugged into the cable modem. I checked the modem by plugging directly into my laptop... it works fine. Is this a common problem? Is there anything I can try other than sending it in for warranty repair?
At this point, before sending it back, I would recommend that you do the following as a minimum:
Power-down the modem, AirPort base station, and computer(s).
Disconnect the AirPort base station from the Internet broadband modem.
While all of the devices are powered-down, perform a "factory default" reset on the base station. This will get it back to its "out-of-the-box" configuration and make setting it up much easier, especially if you use the "Assist me" process within the AirPort Utility. (ref: Resetting an AirPort Base Station or Time Capsule)
After the base station resets, go ahead and power it back down.
Reconnect the AirPort base station to the Internet broadband modem. For the Extreme and Time Capsule, be sure to connect the cable to the base station's WAN (circle-of-dots) port.
Power-up the modem; wait at least 10-15 minutes to allow it adequate time to initialize.
Power-up the AirPort base station; wait at least 5-10 minutes. Note: The AirPort's status light may continue to flash amber after it has intialized. That is because, there may be some additional configuration items necessary, like setting up wireless security, before the overall setup is completed to get a green status.
Power-up your computer(s).
In this basic configuration, the AirPort base station will broadcast an unsecured wireless network with a Network Name (SSID) of Apple Network NNNNNN. Network clients, connected to the base station either by wire or wireless, should now be able to access the Internet through the ISP's modem. Once Internet connectivity has been verified, you can use the AirPort Utility to configure the base station for wireless security and any other desired options. Please post back your results. -
Bluberry iMac Ethernet Cable Not Plugged in???
I am trying to connect a slot loading 350 mhz imac to the internet through the built-in ethernet for a friend that needs it, but the network status pane (OSX.3 Panther) keeps saying the ethernet cable is not plugged in. I've tried several different Cat 5 ethernet cables and it still says this, so we can't connect to the isp (with cable modem). It also says the internal modem is not working, I get the red light next to it and the built-in ethernet buttons in Network status. I've tried direct connections to two different external cable modems, and three different ethernet cables, but I think the problem is a software issue that needs correcting.
I've tried zapping the PRAM, and resetting the nv-ram, but to no avail (as suggested by other posts I've come across). I ran Tech Tool 4 on it and the Network test PASSED.
Is there something I can do in Preferences or terminal to switch these back on so the network can see the modem and built-in ethernet? Any ideas or suggestions would be welcome!!
Thanks! Chuck
iMac 350 mhz Mac OS X (10.3.2)HI Klaus
Thanks for the reply. The router seems to be working, since when I connect it to my laptop (old iBook) via ethernet cable, no problems getting internet.
I also read that to test the card and/or cable I should connect the 2 computers together and turn on file sharing. I did this and was not able to share files. I don't know if that points to the ethernet card/cable or to incompetence on my part...
But I also tried file sharing via Airport card and that worked fine, so I think I have file sharing set up properly. -
WRT54G ethernet cable not being recognized with ps2
As of yesterday I had no problems with my wireless router
but this morning there was a bad thunderstorm
and now when I go to connect to the internet through it
it says "Connection failure! The network cable is disconnected."
but if I wait about thirty seconds the router
says I have a connection and it works fine
I know its not that big of a problem but it is a bit annoying
any suggestions?try changing the ethernet cable
open the NIC's properties and reduce the link speed to 10 Mbps half mode . -
Says ethernet cable not plugged in when it is?
Hi,
This is my first time using this discussion board, but I have a question that has puzzled me and my technical help department at my school.
My computer [a macbok] is connected to the internet [from the computer to a phone jack in the wall] with an ethernet cable. Its been working fine for almost a week, but randomly stopped working last night. After lots of testing, the problem is quite obviously with my computer, which is brand new!
Whenever I plug my ethernet cable in, the network menu under system preferences tells me "The cable for Built-in Ethernet is not plugged in". I have just discovered that it occasionally works if I manually hold the cable in the plug in the computer and press down hard.
Is there some way that something could be stuck in the ethernet plug-in thing on my computer that could be preventing it from connecting to the cable like it used to? Does anyone have any idea how to fix this? My computer is still under warranty, but I am currently living in another country from home, so it would be a pain to have to get a new one or get mine fixed!
Thanks,
Mary.couple of things to try before you call tech support or go to an apple store... sounds like the connection between the ethernet cable and your macbook is faulty. this could be a hardware problem with the macbook, but it could also be a faulty ethernet cable. the ethernet jack could be failing.
try using someone else's ethernet cable and seeing if this connection problem persists.
also, look inside the ethernet jack on your macbook. there should be 8 small copper contact points. these should be parallel. if one is bent or they don't look parallel, then that would make the connection unstable/faulty.
good luck! -
Ethernet: "Cable Not Connected" and Parallels?
Hi, everybody!
So, we've got a Late '06 iMac and we run Parallels to use Windows XP, since my wife's work stuff is not Mac-friendly. Our Ethernet port has not been waking from sleep properly for quite some time. The Network Pane just shows "Cable Not Connected." At first I thought it was my old router, but it's still happening with a three-month-old Time Capsule.
I took it to my local Genius Bar, and was told that this is a "known issue" with Parallels Desktop and Leopard. I uninstalled Parallels for the weekend and deleted its network devices from the pref. pane. The ethernet port worked for a couple of days, but then it was gone again last night.
Has anyone else run into this? Or heard about this "known issue?" I've not been able to find any information about it.
Thanks!
JonI'm seeing the same issue with Nov 2007 iMac. Parallels has never been installed on the machine. Has any progress been made in identifying a solution?
-
First off, I am not a technical guru, so I need help. I have a WRT54G wireless router that I have been using for a couple years. Today, I came home and had no internet signal. I called my ISP (cable), and we reset the modem/router several times. I hard wired the modem to one of my systems, and I get a signal. We came to the conclusion that the ethernet connection is not working on my WRT54G. I am using the same ethernet cable to hard wire right now. Did my router take a dump on me or is there something else I can do?
JasonCheck the status of lights glowing on routers front panel when its connected to your computer and the modem.
You should have an solid green power light, there should be an light glowing on the port where you have connected your computer and also the internet light on router should be ON where you connect your modem, the light for WLAN should be ON as well.
If not then hard reset the router, by holding down the reset button for 1min then unplug the power cable of router first and then release reset button. Wait for 10 secs and plug in the power cable of router. See if you are getting proper lights on router. -
On a 2.16 GHz Intel core 2 duo, running OS 10.5.6 with 2 GB RAM, model "imac 5,1"
This is one of 10 identical machines in a university lab. No updates or changes of any kind have been implemented. One day, it stops accessing the Ethernet network. The Network preferences say "cable not plugged in" when it clearly is.
I did a restart, zapped PRAM, unplugged it and reset the whatever it is that resets, ran permission repairs, all to no avail.
When I swap cables with the machine next to it, the problem stays with this particular computer. In other words, the cable and the network port are not the problem.
I hauled it down to the nearest Genius Bar where, of course, the Ethernet mounted instantly. I took it home, plugged it into my cable modem, and still got the "cable is unplugged" message. This despite the fact that my home iMac is using that same cable for internet.
Brought it back to the lab, and tried plugging it into 3 different ports, using 3 different cables. "Cable is unplugged."
A Google search on the topic shows a fair number of people with the same problem, but no solutions. And I am worried because a 2nd computer started displaying the same symptoms. That one responded to my basic ministrations, but I'm concerned that this is an impending problem for all 10 of these machines.
What can I try?
Thanks!Aloha!
One the one of ten...
Try Resetting the SMC
Carolyn -
Ethernet cable not detected by port
Hello,
The ethernet cable of my laptop is not being detected by port. Also the network adapter settings is not showing lan/ ethernet. This problem arose all of a sudden. I did recovery but no help. I reintalled Realtek LAn all in one window adapter but it did not istall. It gives an error that realtek controller was not found. What should i do now?Hi @microbio ,
Thank you for visiting the HP Support Forums and Welcome. I have looked into your issue about your HP 15 b005DU Notebook and issues with the Ethernet connection. Here is a link to troubleshoot the Internet connections. The Ethernet cable should have a light flashing to show operation. Do you see the light on the cable?
Here is a document on Airplane mode.
If Airplane mode is on you cannot use your WiFi or Ethernet, so Airplane mode should off.
You can do a system restore. System restore will help if something automatically updated and did not go well on the Notebook.
When performing a System restore please note remove any and all USB devices. Disconnect all non-essential devices as they can cause issues.
I hope this helps.
Thanks.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping! -
Trying to connect, but network status says "Ethernet cable not plugged in"
I've got a G5, and I'm using a DSL modem (with 1 ethernet port) and a perfectly functional ethernet cable that is plugged in. Yet I can't connect to the internet, and according to the network status, the ethernet cable is not plugged in. Any help is appreciated.
I've got a G5, and I'm using a DSL modem (with 1
ethernet port) and a perfectly functional ethernet
cable that is plugged in. Yet I can't connect to the
internet, and according to the network status, the
ethernet cable is not plugged in. Any help is
appreciated.
There are only three things which could be wrong.
1 the cable is bad or not properly connected. (most probable)
2 the DSL device (what kind of DSL device, btw?) is bad or has a bad port or is not properly connected.
3 the Mac has a bad ethernet port, a bad ethernet controller chip, or is not properly connected.
I'd verify that the cable has a good connection, first thing. The best way is to unplug it (at both ends) and then plug it back in.
If no joy, I'd go over to a friend's place with Mac, cable, and DSL device.
I'd plug the Mac into the friend's local net, using the friend's cable; if that works, the problem isn't on the Mac. If it doesn't, I'd take the Mac over to a repair shop or would get a wireless card (if not installed already) and a wireless router and connect wirelessly. Be advised that the ethernet port on an iMac is built into the motherboard, and replacing/repairing that port will require a motherboard swap and will be expensive if you're not still under warranty or AppleCare.
If the Mac works with the friend's cable, replace that cable with yours. If it stops working, your cable is bad. Replace it. If it keeps working, your DSL device is bad. Replace it. -
Even though I connect my computers with an ethernet cable the files are still being transferred wirelessly. I can tell because the transfers (usually around 4GB) take a few minutes with AirPort off, but 30 minutes to an hour with AirPort on. I want to transer the files and still have AirPort on since I work on both computers at the same time and want to maintain the connection to the internet.
Be sure Ethernet is listed first in System Prefs > Network.
If it isn't, click the "gear" icon and select Set Service Order.
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