New Mac User - Problem connecting to Internet via work Ethernet cable.

Hi all.
I am having problems connecting to the Internet through my work ethernet cable.
When I plug the cable in, Network settings tells me it's there and working, all of the ip numbers conform to what the IT dep say they should be, but safari won't connect to any site.
I can see the shared folders on the Exchange Server, and access the files no problem, but cannot get any connection to the internet.
Have called Apple Support and they seem to think the issue is with my work's Network which I am starting to agree with. We went through all of the settings together and they said it all looked ok. Then we tried deleting and re-installing the system configuration folder. Still no joy.
Airport works fine, (have tried it on three different routers), as long as the Ethernet cable is unplugged.
If I plug the Ethernet cable directly into a router, it works fine also.
I connect to my work network by running an ethernet cable from the wall socket to my Macbook. It's the same cable that I connect my PC with, and works fine on my PC.
Anyone come across anything similar?
My Macbook is just over a day old and running OS X 10.5.5.
Thanks

For some reason (and it's nothing to do with me) it's all working fine now.
Thanks for your help nonetheless.
Stu:-)

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Hi,
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TCP/IP
Configure IPv4 : Using DHCP
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automatically
Proxies
manually
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Probably yes...
{I say that because I don't remember what mine say
on the cables. They just work, and when they fail,
I get another cable; sometimes the end connectors
get loose or more rare, a wire inside could break...
So, I have spares on hand; probably the right ones.}
• Ethernet: Speed of Ethernet Cabling
http://support.apple.com/kb/TA20669
• Ethernet: Cables Used by Macintosh Computers
http://support.apple.com/kb/TA20668
• Creating a small Ethernet network:
http://support.apple.com/kb/HT1433
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Here was the original post
http://discussions.apple.com/thread.jspa?threadID=875688&tstart=75

New Mac User - Problem connecting to Internet via work Ethernet cable.

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