disabled the wireless interface or have you still got it running. If it is still running disable it.
Click on the "START" button and click on "RUN".
Type in "cmd" and click "OK".
At the command prompt type ipconfig /all and press ENTER. The IP Address should be in the format "192.168.xxx.xxx". If your IP Address starts with "169.254", your configuration is not correct or you are not plugged into the Unit correctly.
Change the Link Speed and Duplex settings (using Device Manager) to use "100 Mbps Full Duplex" or "10 Mbps Full Duplex" instead of Auto Detect.
I take it that you have tried a different cable and reconnected all devices. The device your Ethernet adapter is connected to, such as a broadband modem or network router may be malfunctioning. Try a restart on them. Make sure that the PC is turned off.
Open Internet Explorer and select Tools make sure that the work off line is not ticked. Also go to Internet Options, Connections, Lan settings and make sure that only the automatically detect settings box is ticked unless you have a staric IP. Check that Proxy server. is not ticked. Also make sure that never dial a connection has a tick.
Check in Device Manager to see if there are any Devices with a yellow exclamation mark. If there is reinstall the Drivers.
Keep us informed as to your progress if you require further assistance.
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