Mac Pro no longer connects to network via ethernet.

Since coing back from Thanksgiving break and my Mac Pro 1,1 will no longer connect to my router through via ethernet. This means I can neither connect to internet nor connect to devices like my laptop and Apple TV. Strangely, I can still connect to my Mac Pro from these devices to share screen, play audio/video through iTunes, etc. In Network Settings, I still have a green dot, and I still get an IP address assigned (though I usually use a fixed IP). If I go into my router (Netgear WNDR4000), the router tells me that the Mac Pro 1,1 is connected to the network.
I already have tried the following solutions:
· Restarting router, modem, and computer
· Making a new location in Network Settings
· Trying different ethernet ports
Please Help!

Your local LAN runs through your router.
All your ethernet ports, and your modem and router, should be behind and filtered from excess current. That means a UPS generally. And run input line thru UPS (coax) first, then run RJ45 back through UPS again (there can still be excess surge or current on the line).
Modems and routers can be compromised by surge outage or storm. So can ethernet ports.
You have two ethernet ports and you tried with both also.
What you did not do that I would have added is SMC Reset / Reset NVRAM/PRAM.
This is what I have had for the last year, very nice and stronger signals thruout the house.
http://www.amazon.com/NETGEAR-Wireless-Router-Gigabit-R6200/dp/B008HO9DIG/

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Your local LAN runs through your router.
All your ethernet ports, and your modem and router, should be behind and filtered from excess current. That means a UPS generally. And run input line thru UPS (coax) first, then run RJ45 back through UPS again (there can still be excess surge or current on the line).
Modems and routers can be compromised by surge outage or storm. So can ethernet ports.
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What you did not do that I would have added is SMC Reset / Reset NVRAM/PRAM.
This is what I have had for the last year, very nice and stronger signals thruout the house.
http://www.amazon.com/NETGEAR-Wireless-Router-Gigabit-R6200/dp/B008HO9DIG/

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Thanks for the tip on applejack. Disc Warrior has been good to me but I thought I'd give AJ a try. I downloaded and ran it in the G4 to clear any potential issues. Afterward, I still could not connect with the G4, via either the IP or the computer name.local.
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Temporarily remove the password and all security off the router. Save settings. Now try to connect the printer to your unsecured SSID with no password. Are you successful? If yes, go back and add WPA2-AES encryption with your password and try to connect again. Do not use WPS.
Say thanks by clicking the Kudos Thumbs Up to the right in the post.
If my post resolved your problem, please mark it as an Accepted Solution ...
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Your local LAN runs through your router.
All your ethernet ports, and your modem and router, should be behind and filtered from excess current. That means a UPS generally. And run input line thru UPS (coax) first, then run RJ45 back through UPS again (there can still be excess surge or current on the line).
Modems and routers can be compromised by surge outage or storm. So can ethernet ports.
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What you did not do that I would have added is SMC Reset / Reset NVRAM/PRAM.
This is what I have had for the last year, very nice and stronger signals thruout the house.
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