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Solve : Problem connecting to internet.?

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Dell Dimension 4700 win XP sp2. Had problems with computer including getting on internet using motorola dsl  modem. I can get on internet using another computer connected to same modem with no problems. I eventually replaced mother board and upgraded memory with 2G memory(IG each in slot 1 and 3 as were the others.)
I had ISP tech go through settings with me and conclusion was that some problem with computer nertwork communicating with modem. When pinged received messages 4 times,  timed out and then results, 4 packets sent 0 returned for 100% failure. This is new mboard but same internet connection problem as old one.
Also as I understand the network card is intergrated with mboard. If true and this should still be problem can a plug in network card be installed into the vacant slot and disable  the intergrated card? And how to accomplish this?

Any help is greatly appreciated, Thankshttp://support.dell.com/support/edocs/systems/dim4700/sm/parts.htm
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some problem with computer nertwork communicating with modem.
Do you mean just this problem you were forced to replace the motherboard? I didn't replace just for internet connection only. I had other issues running  computer and getting worse with lockups and more. After inspection inside I found some swelled capacitors and decided with that and age to replace and upgrade with more Ram. Works great now except the internet connection problem.
ThanksDid you install network card driver and check your Device manager for any flags or MARK under your network adapter? How is the network icon connection SHOWING on system tray? What messages do you see when browsing or not able to SURF the internet?I did not install any drivers.   I have one item under Network adapters and no flags of any kind.--      Intel(R) PRO100 VE Network Connection --   Four Driver files all have green check mark in front of each . When clicking IE to open browser, page DISPLAYS--The page cannot be displayed. There is no icon on sys tray. AsI have limited knowledge on what I should do and how to go about it I enjoy trying and learning with the assistance of this site. Quote
Intel(R) PRO100 VE Network Connection --   Four Driver files all have green check mark in front of each .

So it seems like the driver is installed. Can you ping google.com?

Start -> run -> cmd -> ping google.com [press enter]Message received --could not find host google.com. I tried 2nd time same result.1. Go to Start button and hit Run.
2. Type cmd and Enter.
3. Type ipconfig /all >Desktop\Ipconfig.txt (or copy paste this on your cmd window) Enter
4. Open notepad on your desktop and go to Edit -> Select All
5. Edit Menu again and Copy then Paste it on your next reply.

*NOTE the spaces before / and >
I typed info on command line 2 times and command line comes up again. I copied and pasted and command line comes back up. This is what I pasted.     
 ipconfig /all >Desktop\Ipconfig.txt   I only have 2 spaces as you said, one  before the > and one before  /.Jason's asking you for the contents of the new file you've created (which hopefully you will see on your Desktop) called "Ipconfig.txt".Thanks Rob for getting me on right track for Jason. This is the info from the ipconfig requested.


Windows IP Configuration



        Host Name . . . . . . . . . . . . : mitchell

        Primary Dns Suffix  . . . . . . . :

        Node Type . . . . . . . . . . . . : Unknown

        IP Routing Enabled. . . . . . . . : No

        WINS Proxy Enabled. . . . . . . . : No



Ethernet adapter Local Area Connection:



        Connection-specific DNS Suffix  . :

        Description . . . . . . . . . . . : Intel(R) PRO/100 VE Network Connection

        Physical Address. . . . . . . . . : FF-FF-FF-FF-FF-FF

        Dhcp Enabled. . . . . . . . . . . : Yes

        Autoconfiguration Enabled . . . . : Yes

        IP Address. . . . . . . . . . . . : 192.168.5.106

        Subnet Mask . . . . . . . . . . . : 255.255.255.0

        Default Gateway . . . . . . . . . : 192.168.5.1

        DHCP Server . . . . . . . . . . . : 192.168.5.1

        DNS Servers . . . . . . . . . . . : 192.168.1.254

        Lease Obtained. . . . . . . . . . : Monday, October 24, 2011 2:08:18 PM

        Lease Expires . . . . . . . . . . : Tuesday, October 25, 2011 2:08:18 PM

Maybe

ipconfig /flushdns
ipconfig /renew  ipconfig /flushdns successfully flushed DNS Resolve Cache
  ipconfig /renew brought up the following
Connection Specific DNS Suffix:
IP address 192.168.5.106
Subnet Mask 255.255.255.0
Default Gateway 192.168.5.1

Still can't establish internet connection. Location AreaConnection still shows connected with 193 packets sent and 0 returned.
I did reboot after the reconfig procedure.Make sure you are using DHCP and not a static address as seen on your ipconfig text result. To configure IP and DNS server automatically, see this link http://www.wolfson.cam.ac.uk/computers/roomconnection/setdhcp/windowsxp.html Quote
Make sure you are using DHCP and not a static address as seen on your ipconfig text result.

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Dhcp Enabled. . . . . . . . . . . : Yes

It appears to me that he is using DHCP.

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If true and this should still be problem can a plug in network card be installed into the vacant slot and disable  the intergrated card? And how to accomplish this?

I think you should try this now because we aren't getting anywhere. Before you install the new card go to device manager and disable this one.


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