Ethernet Hardwire connection not detected :(

Hey all
I was not sure where to post this but I believe it has to do with screwed up settings within my network preferences. For several month I was using a hardwired Ethernet connection to access the Internet and just recently my MacBook stopped recognizing there was a connection. I have tried several different cables to no avail and when a PC is plugged in, the connection is detected which is why I think it may be an issue with my settings. Any idea how to fix this or revert back to default settings?
Thank you so much

HI,
Your profile indicates you are running 10.4.7 but you posted in the Leopard forum. If indeed you are running 10.4.7, you need to update your system software.
Try repairing disk permissions. Quit any open applications/programs. Launch Disk Utility. (Applications/Utilities) Select MacintoshHD in the panel on the left, select the FirstAid tab. Click: Repair Disk Permissions. When it's finished from the Menu Bar, Quit Disk Utility and restart your Mac. If you see a long list of "messages" in the permissions window, it's ok. That can be ignored. As long as you see, "Permissions Repair Complete" when it's finished... you're done. Quit Disk Utility and restart your Mac.
Carolyn

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Ethernet Hardwire connection not detected :(

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