Ethernet is connected and showing IP, but no connection

I recently upgraded using the combo update for 10.6.6 so originally my online research made me think the issue of showing a green ethernet connection and still not being to connect was that. But today I was able to connect from another connection source. Same cable different ISP, no problems. While at home I am unable to connect.
What diagnostics can I run to resolve my issue of no connection on my home network. By the way, my home connection is my apartments free ethernet jack so no modem or router, which I was using 48 hours ago prior to 10.6.6 upgrade.
Thoughts?

When you change between different ISP connection this is why Apple made the System Preferences->Network pane and at the the top of the pane is "Location". Pull that down and create a custom Location calling it whatever you want. Then in the Network pane click the 'Apply' button to save this new Location. This way you can create and save different Network Locations.
Now if you are connecting directly to a Modem and change devices that is connected directly to a modem, that is bad. You modem is not that sophisticated and is looking for a MAC address (not Mac) that was originally connected to it. So as a Home user you must turn that modem OFF for at least 3 minutes, so the ISP server will start looking for a new MAC address that will connect to that modem.

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