Imac June 2010 Edition Ignores Ethernet Cable Entirely

Hi,i have experienced this issue before and have dealt with it by just connecting wirelessy for months now,but i thought today i would bring it to the community's attention,first and foremost i have fixed this problem before but only for a few startups afterwerds it would no longer connect (by wire)
Here's My Checklist
-"Ethernet"is set to active in System Preferences
-The cord has been tested with other internet based products,and works perfectly,it is also snugly connected to the back on the computer and the router
-there is no problem with the router,modem,and ISP this problem lies with the computer's software/hardware.
-There is a "Red Light" next to "Ethernet" in SP even when the cord is plugged in.
Thank you for your help,and suggestions.

Resetting the SMC doesn't really fix the problem. I've been seeing the same thing on one just bought a few months ago. It only seems to happen after the computer is shut down over the weekend. Resetting the SMC is only a temporary fix at best. I'd suggest trying to get Apple involved.

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