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Windows 7: PC can not detect Ethernet cable

11 Oct 2014   #1

Windows Ultimate x64
PC can not detect Ethernet cable

Yesterday I was playing Orion: Prelude with my friend. We were just about to play space engineers but I had to go and have Dinner. When I came back my internet was working, and then it broke. It had a red X on the Network Icon, normally this just means the the ethernet cable is playing up and when I troubleshoot it fixes it. This time I wasn't so lucky. It failed to fix the problem and it also said "Local Area Connection" does not have a valid IP address, after attempting troubleshoot a few more times it stopped recognising I was connected to a network altogether. It has not been able to recognise the network since yesterday. My Ethernet cable worked with a different PC. The Routers ports are working. And I cleaned the ports in my wall and my PC. The only thing is my PC is not connected directly to the router. It is connected to a port in the wall and then through the port to the router, as does the other PC's using Ethernet besides the one in the office that connects directly which is the one I tested the Ethernet cable with. This problem appeared out of nowhere. I have the latest drivers so if there is anything you can do to help, it would be greatly appreciated. The only thing I can do is carry my PC to the office and test it there.

Sorry for the long description but I didn't want to leave anything out,

My System SpecsSystem Spec
12 Oct 2014   #2

Windows 7 Professional x64 SP1 ; Windows Server 2012 R2 Standard

To better assist you can you please follow this tutorial - Basic Requirements Before Posting your Networking Thread. This can help us identify what may be causing your issue.

As of currently I am assuming a hardware based fault rather than anything software related though I will await the IPconfig results from the tutorial above.

Many Thanks,
Josh :)
My System SpecsSystem Spec
12 Oct 2014   #3

Windows 7 Profession 64-bit

Have you done a full shutdown and boot? That is, exit Windows, shutdown the computer and unplug the computer from the wall (or, if your PSU has one, set the master power switch on the back of the PSU to off)? This is the only way to totally remove all power from your motherboard as the ATX Form Factor standard requires PC PSU's to provide +5Vsb standby voltage to several points on the motherboard to keep settings "alive" - this includes the NIC.

So a full shutdown of the computer will force your computer to reset it's network connection.

Also note that Ethernet cables are cheap, very low-tech, not very robust, but critical network devices that cannot withstand too many yanks or trip-overs. I would replace the cables.
My System SpecsSystem Spec


 PC can not detect Ethernet cable

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