Mac Mini Not Detecting Ethernet NIC

I have a weird one which I hope you can help me with. I have a Mac Mini SL server which operates as a DCHP and netboot server. Yesterday it stopped detecting its ethernet card which was resolved by a reinstall but when I started it today the problem had reappeared.

Is this the integrated NIC, or a USB widget?
Are you using a managed switch?
What do you mean by detecting its Ethernet card? No Ethernet card was found at boot-time? The Ethernet card was found at boot, and then lost or forgotten or disappeared as the system ran? The card was found at boot, then (which still present) disconnects or otherwise stops working?
What command(s) are you using to check this?
In general (and you've probably already confirmed this, but...), see if the connection to the switch is set up correctly, and see if the cable is connected, and swap cable and switch-port as a test...

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I have a Mac Mini Intel Core 2 Duo that I use with my TV. It has 2 GB of ram. And it's running 10.6.8,
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Verify disk and repair permissions also performed, with no anomalies noted.
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Ah, you're right about the N not being supported. Color me stupid on that one...silly me assumed that since I'd only had it a year, and N was around on my other Macs purchased around then, that it was there, but of course the design was a year old already. I'll update the thread post to drop that part.
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I've already confirmed that it is not a router issue or a port/switch issue. I've tried different ports and rebooted the router several times and even updated the router firmware, regardless the Mac still occasionally drops connection. No other computer on the network including a Macbook Pro exhibits this behavior, it is only this Mac Mini that is doing it.
All my Ethernet settings are automatic, and I've tried setting everything to manual as well to no avail. The computer isn't over heating, temps range anywhere from 40C to 75C underload.
I am not sure what is causing this. I haven't run into this problem before and it JUST started recently.
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Hello, might try this...
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
10.5, 10.6, 10.7 & 10.8…
System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
10.5.x/10.6.x/10.7.x/10.8.x instructions...
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
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Mac-mini looses wired ethernet connection

Hey out there.
I know this topic has been covered, however i could not find a solution that works for me.
Last week I bought a intel mac-mini and got home and happily connected it to my wireless router (this all went fine)
I am using a Asus wl500g router.
However, once i updated all the software via the wirless and moved my router closer to my mac-mini.( i am using a 1 meter Cable) it tell's me that my etherent cable is not connected.
So I swapped out my ethernet cable with the one connected to my NAS which is connected to the same router and it is still did not work, Even though it functions fine on my NAS which also had two gigabit ports.
After messing with the setting on my ethernet connection i disabled IP ver 6 and did a renew and all of sudden i had wired ethernet connection.
So i thought that i fixed it. However after the next reboot, the wired connection did not connect again and it continued to tell me that there was not cable attached. I used the same cable connected to the mini to test on my macbook (also intel) and it worked just fine. I also tried swapping the cables from my mac mini and my nas again. My nas device connected with the cable that did not work for the mac and ofcourse my mac told me that i have no cable attached.
I then tried to put my mac to sleep and woke it up again and bam.. i had wired ethernet!
Great, however after another reboot, i have not been able to get connection again or since. this has been for a few days now.
SO what i know is this:
The cables are the right length.
The cabels work!
it should have nothing to do with the fact that my router is 100baseT cause my nas connects to it just fine which as i said also has two gigibit ports.
THe issue is on the mac side that is forsure!
I took my mac back to the store where i bought it and they tested it and they said that is fine, they must be connecting to some airport.
So, could some please tell me what i need to do to get a constant connection between my mac-mini and my router please.
there must be a way of getting it work as it works on and off at random times.
I have been a happy mac user for a few years, so this kind of issue is really puzzling, why does it not just work like most other things MAC?
Buying a airpot extreme is not an option in my books, as the rest of the my mac network functions just fine on my current router.
Looking forward to some inlightenment.
thanks
Dino

Hallo dinodam,
I am having exactly the same problems you are. Everything worked fine for a few months and now I copy you problem identically. Again, the shop in Frankfurt says everything works fine. All my other PCs and cables work.
I have been quietly going around the bend. Every now and again I have a connection for a short while and then it is gone. "Kabel nicht verbunden".
This tends to suggest that the problem lies either in the OS or the hardware, nothing external. Surely someone at Apple must be aware that there is an issue? The time I have wasted on this issue more than covers the cost of buying a new pc. Unless someone has any bright ideas, that is what I shall end up doing and send Apple the macmini back.
I should be grateful for any suggestions how to resolve this.
Thanks,
dilystagi

Mac Mini Not Detecting Ethernet NIC

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