Mini ethernet port no longer works after 10.5.5

After upgrading my Mac Pro, Mini and MBP to 10.5.5 everything is working fine except on my Mini the ethernet no longer establishes a connection, I've tried other cables and connections, but its suddenly dead; I was wondering if anyone else is experiencing this?

Hi
Turn mac off unplug everything, take battery out and press the power button, put battery in and turn on.
Tony

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