MacBook Ethernet Connectivity Problem

Hi everyone:
Just until two weeks ago I was able to plug the ethernet cable into my MacBook in a conference room where I work. Since then it has not worked; the MacBook does not recognise that the cable is plugged in.
An IBM ThinkPad has no problems connecting to the same ethernet cable.-
When I take the cable and plug it directly into the Linksys 48 Port Gigabit Switch that is two floors below the conference room I have no problem. It seems that somehow the distance from the switch makes a difference to the MacBook, even though there was no problem just two weeks ago.
Does anyone know how to resolve this issue? Is it related to a recent update?
Thank you very much for your help.

system updates and installation of software as admin can do bad things to network configurations at time.
Try deleting all the ethernet interfaces specified in System Preferences/Network/ left panel and creating a new one (be sure to make a note of the correct ethernet configuration).
Also, delete Network "Locations" you are not using (again in System Preferences/Network).
Also, you can run this from the command line to get an idea of what configuration is active and network state you have:
ifconfig
Luc P. Beaudoin

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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of this exercise is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login. Boot in safe mode and log in to the account with the problem. First, disconnect all wired peripherals except keyboard, mouse, and monitor, if applicable, and remove all aftermarket expansion cards. The instructions provided by Apple are as follows:
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Hi There,
My Macbook at my new office via ethernet can see the DHCP address and all; however, I cannot connect to use the internet. The local intel adminstrators do not know anything MAC
PS: I have gone into system preferences for network and have looked up the settings and cannot see what the problem is.
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Hi Eddie,
Welcome to Apple Discussions
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*You may get better help from us users if you repost in one of the Forums here:*
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Possibly the Get Online & Networking Forum?
Regards,
Colin R.

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