Network Cable Unplugged, even though it is not (this one is fun, I promise!)

I am plugging my computer into my Linksys router (this computer will not be connecting wirelessly). Unfortunately my computer believes that the network cable is unplugged. Allow me to provide some details before we continue!
Router: Linksys WRT54GL v1.1, with up-to-date firmware
Ethernet Card: Realtek PCIe GBE Family Controller (with up-to-date drivers)
Computer OS: Windows 7 64-bit
And now for the fun part. First, I figured that it was a bad ethernet cable, so I tried another, and another still. The cable does not seem to be the problem.
Second, I figured that it may well be my ethernet card. I plugged the ethernet cable from my cable modem directly in to my ethernet card and was instantly rewarded with a connection. With that, I noted that my ethernet card is not the problem.
Third, I figured, well, it must be the router. I tried the four ports on the back of the router to see if one was bad. None of them worked. The router does not show any lights for ports 1, 2, 3, or 4, no matter where I plug it in. Progress! Certainly it is the router, right? To make certain, I ran an ethernet cord from the router to a laptop and was rewarded once again with a connection. So the router is not the problem.
After doing some reading both here and abroad, I reduced my "Speed & Duplex" to 10 Mbps Half Duplex. That did not solve the problem.
Any and all help would be immensely appreciated, as I am rather frustrated. Please let me know if I can provide any more information for you. Thanks in advance for your help!

The problem with eletronics is that a device doesn't have to be dead but can be somewhat "off specifications" where it works with some devices and not with some others depending on how much "off spec" the other device accepts.
You could try to connect the laptop and desktop directly to each other with a ethernet cross-cable to see how they work together. Otherwise, you should try to replace either the router or the ethernet card to see if it makes the difference.

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I have found additionally these useful websites
http://compnetworking.about.com/od/windowsnetworking/f/cableunplugged.htm
http://www.experts-exchange.com/Networking/Broadband/DSL_Cable/Q_20381405.html

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I have the Realtek RTL8169/8110 Family Gigabit Ethernet NIC onboard LAN, but I cannot get it to say that the cable is plugged in, even though it is. I have tried downloading the latest drivers, with no luck. I'm stuck with using this old 10 Mbps card. I want to use the 10/100/1000 onboard one! Somebody help please.
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and
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http://discountcablesusa.com/ethernet-cables.html
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Reposting as previous topic has been locked although has not been resolved. Original post below, please see previous post for more details
I recently installed a Netgear DG834GT wireless router and now have an intermittent problem connecting my Tecra 9100 to it. If the 9100 has been shutdown for a while (like overnight), when I restart I always get 'Network cable unplugged' for the wireless connection. Rebooting a number of times (anything from 3 upwards) I eventually get connected to the router and all then works fine for hours. Even a quick restart at this point (i.e. once the wireless card has connected) does not cause a problem but as soon as I leave the machine shutdown for a length of time it fails again at reboot.
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Hi
Im not sure why this happen but it seems this has something to do with the OS settings!
I found this very useful MS knowledge base article which could help!
How to troubleshoot the following message in Windows XP: "A network cable is unplugged"
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I recent purchased Toshiba Laptop running Windows 8.1 at local Best buy. The models number is C55-B5302.
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Solved!
Go to Solution.

Try downloading and installing the latest LAN driver:
RealTek LAN Driver File: tc40213700b.exe DOWNLOAD Version: 8.024.1218.2013 Posted Date: 2014-03-13
If that doesn't fix it, it could be faulty. You might want to exchange it.
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I have powered down, removed mother board battery (pain in the ### to get to) reset bios and still now change in Local Area Connection.
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Try to update the newest drivers of the LAN card installed... For updating the drivers you can follow the procedure:
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Change the Link Speed and Duplex settings to use "100 Mbps Full Duplex" or "10 Mbps Full Duplex" instead of Auto Detect.
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Facebook: EA4500 - Network Cable Unplugged

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On your Desktop computer try to change the Ethernet Adapter card speed and then check.
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WRT54G network cable unplugged

I

Try the following tips to resolve your problem:
Disable the Ethernet network adapter if you are not using it. This applies, for example, when running a WiFi home network with computers that have built-in Ethernet adapters. To disable the adapter, double-click the small Network Cable Unplugged error window and choose the Disable option.
Check both ends of the Ethernet cable connected to the adapter to ensure they are not loose.
Replace the Ethernet cable with a different one to verify the cable is not damaged.
Update the network adapter driver software from the manufacturer's Web site.
Change the Link Speed and Duplex settings (using Device Manager) to use "100 Mbps Full Duplex" or "10 Mbps Full Duplex" instead of Auto Detect.
Replace the Ethernet network adapter
Good Luck,
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Network Cable Unplugged, even though it is not (this one is fun, I promise!)

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