Need help unable to connect to the internet, ETHERNET not working, assigned IP address how to fix it on ethernet

I am unable to connect my imac to the internet. I tried to connect direct to the ETHERNET, and I am having ip address assigned problem on ethernet and also on my airport extreme, it said no internet connection or no DNS server. Please help . My internet provider is brighthouse and I just have a technician guy come to check it out and they can't fix it either. I have other laptop and I connect the ethernet directly and it work for my other laptop so I know it is not the internet provider problem, but my IMAC doesn't work. I hope I don't have to do a full recovery on my imac as I have a lot of info need to backup and  I hope someone can help beside doing the full recovery.
Thanks
Carla

Backup everything. Note that a bootable backup/clone is optimum. Then, reinstall the unnamed OS.
iMac (27-inch Mid 2011), OS X Mavericks (10.9.3), SL & ML, G4 450 MP w/Leopard, 9.2.2

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