Ethernet Has Randomluy Stopped Working

Hi folks. My ethernet on my Macbook has been working fine since I got it back in June, that is up until today. I typically don't use the ethernet, usually use the wireless, but decided today that I wanted to download a movie on itunes and figured it'd be faster using the ethernet. So I plug the cable in, and no connection is made. I look at my router and see that the light for that specific port isn't even on; the router isn't seeing the laptop at all. Took the laptop over to a friend's house with a completely different router; no luck. Tried hooking the laptop directly to the cable modem; no luck.
The ethernet had been working in the past. I recently had the Apple Store replace a faulty trackpad, and haven't tried the ethernet since, so perhaps there's a connection between the two? I'm really getting annoyed; when a customer spends nearly $2k on a laptop, I don't expect things to keep going wrong. I use this product for work and if I have to send it away to get fixed, I lose money by not being able to do work. Any recommendations before I throw a tantrum in the Apple store?

yeah, I had same issue with brand new Macbook the other day.
Built in ethernet (not the wifi) wouldn't detect the live drop. Enabled root access, then opened terminal.
Typing "ifconfig en0 enable" still showed the interface down
and inactive. Called apple, tech agreed with my assessment, said to return to apple store and do a swap out.
This computer was 2 days out of the store , btw

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Ethernet has completely stopped working

Here is what happened:
This morning, my ethernet port was working just fine. I could and did connect to the internet.
I was working on my Windows side (recently installed Windows 7 from Windows XP Service Pack 3 on Boot Camp. Installed both the drivers from my original computer and the Boot Camp drivers up to 3.1)
I plugged in my external hard drive and was fooling around with a few things on it, then left it and continued to work on my computer. I wanted to safely eject the external hard drive so, I went to the eject option. It told me that a program was still using it and I was not able to eject it. When I had this problem on my Mac side, the recommendation was to simply log off and log back in and then I could eject it safely. Since that has worked on my Mac side, I tried it on my Windows side. However, after 10+ minutes of Windows "Logging me out" I got frustrated (I'm at work) and manually shut down the computer by holding down the power button.
I started my computer back up to my Mac side because I had some files on there that I wanted to put on my external hard drive. After doing so, I went back on my Windows side to find out that I could not connect to the internet. (The only way for me to connect to the internet at work is through an ethernet cable. Right now, I am using my co-worker's computer). It said that there was something wrong with the NVIDIA (SP?) ethernet program/whatever it is.
I logged back onto my Mac side and I am having the same problem, I cannot get my ethernet to connect. I tried a different port and that one didn't work either so it's not the ethernet port or the ethernet cable, it is definitely my computer.
Can I simply re-download the Boot Camp 3.1 driver and have it work again? Or is it something wrong with my ethernet jack period?
I don't understand why manually restarting my computer would have caused such a problem. I have done it before on my Windows side once and countless amounts of times on my Mac side (I have had my computer for a good 3/4 years now).
It is out of warranty which is why I came here with my problem. Hopefully someone knows how to fix it. Thanks in advance!

Disconnect all the cables from Linksys router.
Connect a computer to the Ethernet port 1 on Linksys router. Connect the power cable to the router. Press and hold the reset button on the router for 30 seconds. Release the reset button and wait for 30 seconds. Power cycle the router.
Now check the IP address on your computer.
If you are getting a valid IP address like 192.168.1.xxx then try to ping the IP address of the router 192.168.1.1 . If you get replies from the router IP address then try to access the setup page of the router.
If you are getting auto configuration IP address then assign a static IP address to the computer and then try to access the setup page of the router.
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Ethernet Port randomly stopped working - u310 ultrabook

Hi,
So my Ethernet Port on the u310 Ideapad has randomly stopped working - by that I mean that when I plug in my LAN wire, the lights will show only when I switch on my laptop, till the Windows logo comes on, which is when the lights of the port go off and the port refuses to work.
I need LAN pretty urgently, so I was wondering if someone could please help me out! Thanks!

Hi Ipsh,
thanks for posting and welcome to the community. Based from your post there is apossibility that it it could be hardware. But however before we confirm let just trya few setting and software adjustment first. At this point I was just wondering if you have tried doing a software update, I would suggest you to uninstall the current drivers you have now and reinstall the drivers below.
http://download.lenovo.com/consumer/mobiles/0wla01ww.exe
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Try here:
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I took my iPhone to the Service center of M/s RSG INFOTECH PRIVATE LIMITED on April 17, 2014.
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You can log in to Adobe.com with your credentials .If you do not have any prior credentials ,you need to create an account .Adobe.com will either let you purchase the product or opt for a trial version.
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The nearest service center is 2 hours from my house and my computer isn't under warranty anymore, so I need alternative options. I'm just frustrated that my disc drive was totally fine until AFTER I took it in for service. I just paid a lot of money for a new hard drive from the apple store and now my disc drive has suddenly stopped working correctly. I tried with multiple CD's and DVD's...loading a disc, but my computer would just make a weird loading noise and then eject the discs. Now it has started fighting taking the disc, so I have stopped trying. Is there anyway to fix this problem without taking it in for service again and paying another boat load of money?
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ShelbyMackenzieLynne,
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When you’d updated your MacBook Pro to Mavericks, did the installation succeed, and subsequently freeze up? Or did it freeze up during the Mavericks installation?
Which version of OS X was installed on your MacBook Pro before you’d installed Mavericks?
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Iphoto has recently stopped working; it continually shows the loading circle. I’ve uninstalled and reinstalled it, updated it

Iphoto has recently stopped working; it continually shows the loading circle. I’ve uninstalled and reinstalled it,updated it and reinstalled all my apps with the ‘applications install DVD’ however it still does not work. I have also tried holding the command and option key while pressing iphoto then when the pop up appears i press the checkboxes that have been suggested by other users however nothing happens. Any other suggestions would be great!

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Ethernet Has Randomluy Stopped Working

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