Desktop no LAN light

March 31, 2013 at 22:25:44
Specs: windows 7, Core2Duo
Hi guys,

I have a bunch of PC's here in our computer shop

Asus mobo P5SD2-VM
1gb Kingston RAM
Core2duo 2.9ghz processor

It was a WinXP before but i've installed Win7 on it since i'm planning to sell it.
Everything went fine except for the LAN. Nothing happens when i connect the RJ45 lan cable. Even the LAN light doesn't make any sign that it is connected to a network.

what i did is, to check whether the Lan cable is the defective one so i plugged that Lan cable to my laptop and it does have connection and i can browse the internet.
I also check under the Network and sharing center if the LAN device is disable but it's not.
Then i get another set of Desktop and reformat it also with Win7.
This time after i've installed win7 on it, the LAN on the latter's desktop is working fine not like the first one.
I'm thinking that maybe it's all about how i installed the OS. because when i installed on the 2nd desktop, the Lan cable is attached on the machine. does it make any difference when you install OS with Lan cable connected and without Lan cable connected?

another thing i've noticed in the first desktop is when i switch on its AVR, there is no LAN light compared to the second desktop which LAN automatically lits when i switch on the AVR before actually switching on the Desktop.

Is there any other solutions to make that LAN work?
I also tried to remove the CMOS on the first desktop for a minute then return it then after booting i tried to uninstall the LAN in the device manager then re-install it then restart the machine again but still its LAN is not working even if it says that SiS191 Ethernet Controller is successfully installed. and that the device is working properly and has an updated driver.

Hope someone help me with this one.

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March 31, 2013 at 23:06:55
Why not just install a new PCI Network card? That should work fine and is really inexpensive anymore.

Some HELP in posting on plus free progs and instructions 7 Golds

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April 1, 2013 at 04:58:28
If you cannot confirm that the NIC was working prior to installing W7, then it is probably burned out. I had all of my NIC's on my home network fried when a lightning strike to the chimney of the house next door caused a feed back through the cable. Disabling the built in NIC's and adding the NIC/PCI cards solved the problem quickly for under $15. per computer retail (under $10. is certainly possible) and the problem was fixed.
If you are sure that it was working in XP, you can try reinstalling the driver, but as XP... said, just install the card, tape over the old port with a little piece of electrical or duct tape and don't waste the time messing around.

You have to be a little bit crazy to keep you from going insane.

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April 1, 2013 at 07:12:30
I think you have the wrong adapter type installed. It is NOT an SIS network adapter.

See the specs for that board in the link below.

Download the correct drivers for all the hardware on that board and install.

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Related Solutions

April 1, 2013 at 08:01:10
I am assuming on what Fingers has said. That It might be burned out as when i switch on the AVR there's no sign that LAN was alright and functional. Because as far as i've checked with the other desktops here, the LAN will usually lit orange even if i just switched only the AVR and without switching the desktop power button. And in the case of the first desktop it doesn't lit when AVR is switched on and even after pressing the desktop power button.

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April 1, 2013 at 08:55:09
If the network adapter was burned out I don't think it would show in Device Manager.

Did you try installing the latest driver from Asus?

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April 2, 2013 at 06:36:47
"I have a bunch of PC's here in our computer shop"
and they all have bad lan adaptors at the same time?
install the correct drivers.


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April 3, 2013 at 07:37:13
@Othehill, yeah that's also the thing that's bothering me. i think you made some point here. But nope I didn't install any LAN driver but as what i've said, I've installed win7 on 2 different desktops. The first desktop is the one that has a problem on LAN. That it doesn't recognize any RJ45 lan cable when i plug it in. But the second desktop, (with same mobo,processor,memory,Ram,HDD with the first one) i also let the win7 install thoroughly and i dont see any problem when i connect LAN on it.
And for the record, i've been able to install win7 on third and fourth Desktop that i'm going to sell, without doing anything different from what i've done from the first desktop. And it turned out that the 2nd to fourth desktop doesn't show any problem with the LAN. But It's the first PC that's bothering me with this LAN thing.

@larry... its only the first desktop that has a problem on LAN. but the rest of the desktops that i've installed win7 doesnt have any LAN problem. Im done installing win7 on my fourth desktop and it is also working fine not like the first one.

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April 3, 2013 at 08:16:40
Different versions of the same motherboard may have different hardware on them. This is common practice. At any rate, if the network adapter show in Device Manager as working properly then the next step is to install the correct driver. If the correct driver is already installed then Windows will tell you that and at that time you might conclude there is a physical problem with the adapter.

Have you tried removing the network adapter from Device Manager and then rebooting?

Have you tried updating the network adapter drivers while in Device Manager?

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April 15, 2013 at 23:26:11
@otheHill, Yup i've tried removing the network adapter in the device manager then reboot but still nothing happens.

Also i've tried updating the network adapter drivers in the device manager but still nothing happens.

I also tried to uninstall the network adapter in the device manager and tried other updated drivers and says that i have successfully updated the driver but still there's no sign of life in LAN.

I'm really out of options to do. any other suggestions?

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April 16, 2013 at 07:32:39
The light on the LAN will only light up after there is a successful connection to the network. So, you may have a bad cable or connection to the network.

One other possibility is the contacts in the adapter are jacked up. If someone connected a phone cable to it they may have bent something. Look in there with a flashlight. None of the contacts should touch another contact.

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April 16, 2013 at 10:23:40

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April 16, 2013 at 13:56:33
So if the computer is off, and you have activity lights on your Ethernet jack then you have bad drivers in windows. If there are no lights, you have a bad connection. Clean the contacts with a cotton swab and some rubbing alcohol.

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April 17, 2013 at 22:04:40
@otheHill, nope i've tried different working cables from other desktop but cables are not the problem. also i've checked the pins in the desktop LAN and i can say it is properly aligned and nothing seems to be unusual.

@getti, good idea, Im definitely gonna give it a try to clean the contacts with cotton and alcohol. Let's see what will happen.

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April 18, 2013 at 10:13:18

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April 18, 2013 at 12:45:49

51910 may not want to spend cash on the card. Of course, they may eventually have to.

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