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The LAN cable connection to my router stopped working a while ago under Windows 7-64 bit. I don't use it for Internet connection for which I have a USB 3G modem.

I bought a new router, but got the same symptom with that.

I have a dual boot setup, so for a test I switched to my rarely-used Windows 7-32 bit partition. It works there OK.

In the failing (64 bit) setup, the lights on the router and the LAN card both show activity flicker. An unplugged cable is correctly reported in the Network connections window. When plugged in it is reported as 'Unidentified network'. I cannot ping the router on its address (192.168.2.1).

Windows networking diagnostics find nothing.




asked 12/01/2011 08:29

GrahamSkan's gravatar image

GrahamSkan ♦♦


21 Answers:
Find the ethernet driver for your Windows 7 wired network card. If Intel, Windows will have it. Uninstall the NIC, restart and allow it to re-install. That will also reset TCP/IP on the way by. Make sure you are using a DHCP connection and try again. Let us know. .... Thinkpads_User
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answered

thinkpads_user's gravatar image

thinkpads_user

I actually have two (built in) LAN connections, one NVIDIA, and one Marvell Yukon. Each has the same symptoms, but I'll try it... Er what's a NIC?
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answered 2011-12-01 at 16:43:48

GrahamSkan's gravatar image

GrahamSkan

NIC = Network Interface Card.

Windows likes to have one working NIC, and so you might try uninstalling one (and leaving uninstalled temporarily) to see if the other works.

.... Thinkpads_User
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answered 2011-12-01 at 16:51:48

thinkpads_user's gravatar image

thinkpads_user

Sounds to me like a bad CAT-5 cable.
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answered 2011-12-01 at 16:55:57

sjklein42's gravatar image

sjklein42

>>> for a test I switched to my rarely-used Windows 7-32 bit partition. It works there OK

That would indicate the cable is probably OK. .... Thinkapds_User
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answered 2011-12-01 at 17:01:28

thinkpads_user's gravatar image

thinkpads_user

I can't unplug the cards. They are built-in to the motherboard, but I'll check in the Device Manager.

sjklein42,
Thanks, but it works if I boot to another OS setup with the same hardware.

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answered 2011-12-01 at 17:04:17

GrahamSkan's gravatar image

GrahamSkan

I'm such a slow typist.
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answered 2011-12-01 at 17:09:32

GrahamSkan's gravatar image

GrahamSkan

In Device Manager, you can disable one of the cards. Do that and work with the other. Change over and try again. Does either one work with the other one disabled. ... Thinkpads_User
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answered 2011-12-01 at 17:10:48

thinkpads_user's gravatar image

thinkpads_user

I've  uninstalled the Marvell Yukon. The NVIDIA still doesn't work. Will swap over
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answered 2011-12-01 at 17:12:45

GrahamSkan's gravatar image

GrahamSkan

thinkpads_user:  You're right.  I missed that.
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answered 2011-12-01 at 17:19:33

sjklein42's gravatar image

sjklein42

There is an Ethernet Controller showing with a yellow exclamation mark under Other devices. Windows can't find a driver for it.
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answered 2011-12-01 at 17:22:12

GrahamSkan's gravatar image

GrahamSkan

I am not sure what you did / were doing when making the computer dual boot. Did you put all the correct drivers into the Windows 64-bit machine?  It seems not.

Look for Chipset Driver, NVIDIA driver, Marvel driver, and see if these can be re-installed. You need to find out what is missing. Chipset is a likely suspect, but NVIDIA may be screwed up as well. .... Thinkpads_User
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answered 2011-12-01 at 17:22:42

thinkpads_user's gravatar image

thinkpads_user

Success. The Marvell Yukon is now working
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answered 2011-12-01 at 17:27:22

GrahamSkan's gravatar image

GrahamSkan

Good. So at least keep the other network card disabled until you get all the problems worked out.

.... Thinkpads_User
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answered 2011-12-01 at 17:28:02

thinkpads_user's gravatar image

thinkpads_user

I only mentioned the dual boot, to show that the hardware was OK. Both worked OK, bit I lost the functionality under the 64-bit setup only.
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answered 2011-12-01 at 17:30:20

GrahamSkan's gravatar image

GrahamSkan

You have the network now working as desired in your original question. But the Windows 64-bit is dual boot and therefore completely independent of the other machine. So you need to make sure you have all your drivers installed. That is independent of the 32-bit machine.

Meantime, getting down to one card has your network working. ... Thinkpads_User
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answered 2011-12-01 at 17:30:40

thinkpads_user's gravatar image

thinkpads_user

They are both now working properly. Thank you.

Windows 7 gives the impression that everything is so seamless that it isn't necessary to go back to device manager.

Mind you I've tried to disable most of the new stuff, with windows popping up and  then disappearing whenever the mouse is moved.
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answered 2011-12-01 at 17:33:35

GrahamSkan's gravatar image

GrahamSkan

Hello GrahamSkan - You probably should close this question as it has been answered and your LAN connection is working.  You may wish to start another question on drivers if you still have unknown devices. Thanks, .... Thinkpads_User
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answered 2011-12-01 at 17:38:53

thinkpads_user's gravatar image

thinkpads_user

Thanks Thinkpads_User,

I thought that I had, by accepting your first comment. But it was late here and perhaps I didn't quite finish the job.

Thanks again
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answered 2011-12-02 at 03:52:24

GrahamSkan's gravatar image

GrahamSkan

Solved a two-month old problem. Cheers.
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answered 2011-12-02 at 04:15:48

GrahamSkan's gravatar image

GrahamSkan

Thanks. Two months is a long time, and I am glad it is now working. Thinkpads_User
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answered 2011-12-02 at 04:17:32

thinkpads_user's gravatar image

thinkpads_user

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Asked: 12/01/2011 08:29

Seen: 217 times

Last updated: 12/01/2011 08:17