No Wired Connection to PC

I have AT&T U-Verse with a 2Wire (3801 HGV) router. I've had the service for about a month without any issues. As of now, I am able to connect to the internet using WiFi (via my Wii, iPhone, and Laptop), but when trying to make a WIRED connection (via ethernet cable from the 2wire router directly to the PC), all I get is a yellow icon.

If I unplug the ethernet cable and plug it back it, the blue circle appears for a while, then back to the yellow error icon. In the Network and Sharing Center, I am showing my PC with a broken connection (yellow triangle) to "Unidentified Network with a broken "red X" connection the Internet. I thought maybe it was the ethernet cable, so I tried a wired connection from the router to my laptop (also running Windows 7) and it works just fine, so I've determined it must have something to do with the PC itself.

I've tried doing a system rollback, resetting the router itself, made sure the network driver on the PC was up to date and ran the test to make sure it's working propertly.....all with no luck.

I've tried using Windows to diagnose the problem and I get "Problems Found: Local Area Connection doesn't have a valid IP configuration".

What baffles me is it was working fine up until a few days ago. I have pulled my hair out trying to figure this out! Any help with this issue would be fantastic. Thanks!!!!!

Open the wired connection properties in network and sharing center, set the nic ip manually in the router's valid range.

Bill2 said:

Open the wired connection properties in network and sharing center, set the nic ip manually in the router's valid range.

I'm sorry...i'll need more detailed instructions on how to do this

OK.

While still connected on wifi, open a command prompt window (click Start button, type cmd in the run or search box, hit Enter), type ipconfig, hit Enter. Note down the values you see for IPv4 address, subnet mask and default gateway. Post them here, then we'll go to the next step. If you know how to use the snipping tool, you can take a screenshot of the cmd window showing the results and post it here.

Bill2 said:

OK.

While still connected on wifi, open a command prompt window (click Start button, type cmd in the run or search box, hit Enter), type ipconfig, hit Enter. Note down the values you see for IPv4 address, subnet mask and default gateway. Post them here, then we'll go to the next step. If you know how to use the snipping tool, you can take a screenshot of the cmd window showing the results and post it here.

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Users\Brandon>ipconfig

Windows IP Configuration


Wireless LAN adapter Wireless Network Connection:

Connection-specific DNS Suffix . : gateway.2wire.net
Link-local IPv6 Address . . . . . : fe80::495c:46eb:4b55:66bf%12
IPv4 Address. . . . . . . . . . . : 192.168.1.67
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.254

Ethernet adapter Local Area Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : gateway.2wire.net

Tunnel adapter isatap.gateway.2wire.net:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : gateway.2wire.net

Tunnel adapter Local Area Connection* 11:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Tunnel adapter Local Area Connection* 9:

Connection-specific DNS Suffix . :
IPv6 Address. . . . . . . . . . . : 2001:0:4137:9e76:1ca8:3f82:3f57:febc
Link-local IPv6 Address . . . . . : fe80::1ca8:3f82:3f57:febc%14
Default Gateway . . . . . . . . . : ::

C:\Users\Brandon>

And just pointing out....what I just posted is from my laptop connected to the wifi. The problem is with my PC, which is not wireless capable....only Ethernet.

OK. Your subnet mask is 255.255.255.0 and the default gateway is 192.168.1.254. Now follow this walkthrough.

How to Assign a Static IP Address in XP, Vista, or Windows 7 - How-To Geek

Set your ipv4 settings like this- for ip address use any address from 192.168.1.2 to 192.168.1.253. Remember every connection on every computer must have a unique IP. So, lets say set the ip to 192.168.1.37 (randomly selected, in case this conflicts with another computer, just change the last number). The subnet mask gets filled automatically. The default gateway should be set to 192.168.1.254 (router's ip).

Set the preferred DNS server the same as the default gateway, leave the alternate dns server blank.

Not to confuse you but when one sets ip manually, one normally switches off DHCP on the router. DHCP lets your router assign ip addresses on the fly, which is what we are avoiding here because its not working properly. But first try out the steps I gave above.

Tried it...no dice. Same problem

Recheck the settings. Also Click on "Validate settings on exit" button.

On your laptop, are the settings configured manually or is it "Obtain ip address automatically"?

You may need to turn off dhcp on the router. Login to the router and navigate to the DHCP settings and disable.

Also make sure the ethernet card is installed correctly. Check in device manager that theres no yellow exclamation mark against it.