Mac pro no longer connects to web via internet sharing

My Mac Pro does not have an airport card so I have often used a PowerBook G4 or MacBook Pro to share a wireless internet connection via ethernet. A few months ago this method began failing but I was able to share a connection via firewire. Now I am not able to do either.
I have attempted to use both the mbp and the pbg4 to no avail using both ethernet and firewire for days, employing various troubleshooting methods including zapping PRAM, repairing permissions, and dumping network cache. I've tried static IP addresses and manual setups. The mac pro shows that it is connected to a network and displays all the proper IP information but is unable to load a web page and the diagnostics window shows an ISP, server, and internet failure regardless of any changes I make to network settings on it or the mbp/pbg4. Meanwhile, the laptops are connected to the internet just fine and are able to share a connection with each other.
What can I do to make my tower susceptible to internet sharing once again?

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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