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Internet connection works fine until I plug in desktop ethernet cable

Last response: in Networking
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November 28, 2013 11:01:09 AM

Ok this one is baffling me. I have multiple computers on my home network, two desktops connected via ethernet cable and a macbook connected via wireless.

As soon as I plug one of my desktop computers into the wall jack with an ethernet cable our internet connection to the rest of the computers (my macbook and other desktop) cuts out. It shows that i can still see the network but I'm unable to ping the router. As soon as I physically unplug the ethernet cable from the wall jack to that particular desktop, the internet connection magically returns.

Additional info I forgot to mention earlier:
- If that particular desktop computer is connected via the ethernet cable to the wall jack and the computer is turned on the internet works for that computer and the others as well.
- As soon as I turn the desktop computer off, while still connected to the ethernet wall jack the internet will cut out.
- If I disconnect the ethernet cable from the wall jack that that particular desktop uses the internet returns.

I'm now thinking it might be malware or a virus, possibly faulty wiring, router went south, bad motherboard? Has anyone seen anything like this before? This all started happening yesterday.

Any help would be appreciated!
November 28, 2013 11:09:06 AM

The wall jack may be improperly wired; the cable run from the wall jack to the router may be shorted due to rodent bite or being caught by a wall stud or screw; the cable from the wall jack may be improperly wired at the router. if the wall jack has worked sometime in the past, I would bet on rodent damage. It is very common.
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November 28, 2013 12:05:07 PM

Dogsnake said:
The wall jack may be improperly wired; the cable run from the wall jack to the router may be shorted due to rodent bite or being caught by a wall stud or screw; the cable from the wall jack may be improperly wired at the router. if the wall jack has worked sometime in the past, I would bet on rodent damage. It is very common.


Hey thanks for the reply, I made mistake about the ethernet cable being plugged in by itself, it was actually still plugged into my desktop. Added some additional info below. So I'm thinking it's something with my desktop, possibly malware or a bad motherboard maybe?

- If that particular desktop computer is connected via the ethernet cable to the wall jack and the computer is turned on the internet works for that computer and the others as well.
- As soon as I turn the desktop computer off, while still connected to the ethernet wall jack the internet will cut out.
- If I disconnect the ethernet cable from the wall jack that that particular desktop uses the internet returns.
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Best solution

November 28, 2013 10:44:43 PM

Ok so now If I understand, if you have an Ethernet cable plugged into the jack and no computer attached to the cable all is good. If this is true then you have isolated the issue to the desktop system. Can you attach the wall jack cable to another system (like the MacBook since it is easy to move around)? Does the MacBook cause the same issues? If it works ok and when shut off the rest of the network is ok; then for sure the issue is with the desktop. So if that's the case go to control panel/system/device manager (talking about the problem desktop system). Check the network adapter tab. Make sure it is working properly. Look at properties/power saving and un-check everything. If your MB has two network adapters (mine does) make sure the one you are using is enabled in the bios and the other disabled. If the desktop has more than one Ethernet port, try one of the others. Also make sure that the cable that feeds that wall jack is attached to the correct port on the router. Usually you will have 4-6 ports for devices and one more labeled "Internet" or something similar.
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