|I'm guessing from your cryptic question you can't connect when you try to plug in but can when you connect wirelessly.|
Typically, when you can't connect, you get some kind of error message. That would have been excellent information to include in your question to help us help you.
- bad cable
- bad NIC (possibly, NIC is not enabled)
- bad port on router/switch
- you have your wireless NIC enabled and are already connected wirelessly when attempting to connect with the wired connection.
First, disable your wireless interface and ensure your wired interface is enabled and set to get it's TCP/IP settings automatically (from DHCP). Then plug in. What if any error messages are you getting when you do this?
If you don't get an error message, see if you can't surf the web. If it's working, report back here. If you can't surf, open a command prompt window (ie: Start >> Run >> type cmd and hit Enter) and perform the following command:
Post the output of the command in a response here for us to see. For info on how to copy/paste from a command prompt window, click on my name above in my response and read my "how-to" guide titled, "◦Post the output of ipconfig (version 2)"
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.