Ethernet Card Not being Detected on my iMac 27Inch (Mid2010)

Hello,
I have only had my iMac for a couple of months, and it appears to have developed a fault. I have a network router, and a network cable is plugged in however, the Network Panel keeps reading as "Cable: Unplugged". It is not, i can assure you.
When I got into the About This Mac > System Profiler, it has "This computer does not appear to have any PCI Ethernet cards installed." under the Ethernet Card option
I'm currently on Wireless (very skechty), and that also keeps dropping out even though the router is less a foot from the iMac.
Any Solutions or Advise please?
Thanks Phill C

I have the same problem after I installed LION on my imac 27" (Late 2010). It was working for few days and then after I restarted my computer my network card just went dead. Since I have several partitions I can boot back to Snow Leopard and it shows me ethernet just fine. So it means that LION has bugs and many bugs from what I can tell. It is wide spread problem and not sure if apple is doing anything about htis.

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If you are searching the registry, check for the "Senforce" string. It should be at HKLM\Software\Senforce
Try running the install program for the ZSC with the following command line:
setup.exe /V"STUNINSTALL=1"
If you've specified an uninstall password, try this one instead:
setup.exe /V"STUNINSTALL=1 STUIP=password"" (please note the double quote at the end)
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Daniel
>>>
From: Andy_DeWees<[email protected] du>
To:novell.support.zenworks.endpoint-security-management
Date: 2/5/2009 12:52 PM
Subject: I have installed the agent 10 or 15 times and one installation hasfailed, no error appeared during the installation but I am havinginconsistent issues with my ethernet card not working here and there. Werebooted and can log into Novell client but the login prompt did not appearfor ESM client or the icon was not in the systray. Everything seems towork, besides at times (a couple times today) it terminates his ethernetcard/connection. I would re-image his computer but he has severalapplications and
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