Have Lost Ethernet Connection on MacMini (MC270LL/A)

       Recently while checking the speed of my cable modem (I do this by moving the ethernet cable directly to my MacMini rather than to the Airport Extreme. Then I reboot both the DOCSIS Modem as well as the computer.) But back to the point. Recently while attempting to check the speed of the cable modem I got a message from Network Prefs that said "Ethernet NOT CONNECTED," "Cable Unplugged." I've zapped the PRAM, checked the ethernet cable, which is obviously working since I have no problem getting a good signal from the Airport Extreme..
       In fact, when I connect the ethernet cable from a Motorola DOCSIS cable modem directly to the Airport Extreme I get a fine signal for all my equipment. Using Apple's Airport Extreme, SpeedTest usually shows around 23000 to 27000kbps Downstream, and a little over 2000kbps Upstream. This is with an iPad, a WiFi Blueray, one of the two Apple TVs, a laptop, 2 iPhones, and most importantly the MacMini itself, all running at the same time. I get 33000kbps with only the MacMini and the iPad. So my speed is good. Not the 50000kbps advertised, but I certainly can't complain.
       The only logical explanation I can think of is that I either have a bad ethernet card, or that the ethernet plug itself is damaged inside where the damage can't be seen.
         So, am I looking for a new Ethernet Card, or can a damaged connection be repaired at an Apple Store? Or do I just have to live with this situation until either the Airport Extreme or the WiFi Card in the MacMini die too? It seems likely to me that my MacMini from mid 2000 (MC270LL/A) has a bad ethernet card. But I would LOVE to hear that this could be a software problem that could be fixed. Or even that the MacMini could be repaired for a reasonable price.
       Thanks in advance for any advice you can give me.

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 the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, or by corruption of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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Have Lost Ethernet Connection on MacMini (MC270LL/A)

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