My mac mini will connect via airport but not via ethernet.

I have had a mac mini for several months which I connect via ethernet because it is in a part of my house where the wireless signal is poor. I changed ISP and now I can connect to the router wirelessly but not via ethernet. This doesn't seem to be a problem with the network as the connection works when I connect it to my mac book. Firewall is turned off. There were no major changes to the router settings other than changing the ISP login codes.
Any ideas? Is this a configuration issue or a hardware problem?

Hi Mick,
If your router only supports 10/100 ethernet then it is possible that the auto-detect feature is not working properly to adjust to that speed. The mini has a Gigabit ethernet port. The OS by default sets the port to automatically negotiate the rate but it does not always work and the result is the problem you are having.
To fix it you wlll have to manually set the rate to 100.
To do this, open your system preferences, Select Network. Highlight the ethernet port on the sidebar, click the advanced button. Click on the Ethernet Tab, set the configure pop-up menu item to 100baseTX and click the ok button. If all works out you should see that the Ethernet port icon should turn green.
Hope this helps.

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