Wired iMac Ethernet corrupts network

We've had our iMac for about 2 weeks without issue. The iMac uses a wired connection to a Linksys router, and we have about 5 other devices in the house using the wireless connection.
Last night we started having problems using the Wireless for both internal network and Internet applications. After a bit of searching, we determined it was the wired iMac connection. We can connect other wired devices to the router without problem or interference.
I thought it was the router, so I used an older Netgear router that I had available. The iMac will not receive an IP address when wired to the Netgear.
So I disconnected the iMac from the Linksys, and use the AirPort for connectivity without problem.
Any ideas? At this point I think it is hardware related.

If you have your network set up so that the router assigns the IP addresses to each computer on the network, in System Preferences Network pane Ethernet Advanced settings TCP/IP tab, it should be set to Configure +Using DHCP+. That is the default setting, and the network configuration that most people use.
Is that how your network and other computers are currently set up? If not, you may need to adjust the iMac's settings to +fit in+ with what you already have set up.
If that is the current setup, you may want to reset everything. Power off all computers. Power off the router. Turn the router back on and give it a few minutes. Then power on one computer at a time and check that is has joined the network (has Internet access), saving the iMac for last. Power on the iMac and see if it still disrupts the connection of the other computers.

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John, thanks for the email so quickly.
I too hope I haven't tried "everything" either but I am reasonably technical. I had done what you suggested to do before but I did both again.
Ethernet is yellow in the left side bar. In the right pane it's status says Connected but then below it says "Ethernet has a self-assigned IP address and will not be able to connect to the Internet."
I have tried the assist me menu and Network Status has Ethernet Green, Network settings Yellow, ISP Green, and Internet and Server Red and Failed for both. I have turned things off and on, checked cables, deleted all locations and tried restting them up but to no avail. I even disconnected everything and connected the mac directly into the cable modem itself and the thing still will not connect.
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Hello.
I feel like an idiot.
I have build pc's and have my own network at home.
And for some reason i cant fit my ethernet cable into the imac.
I just bought this imac so its the new g5 w/isight.
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Wired iMac Ethernet corrupts network

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