Internet & network

I found this post from a couple of years ago and it sounds almost exactly like the problem I am having:
"I am working in a small office. We have 4 computers on the network and three printers. This morning out of the blue, two of the computers will not connect to our Network (other computers and Internet) but will print. The other two will connect to the network, but will not print or recognize the printers. How can this be? We shut everything down (computers, printers, hubs, dsl modem, etc.) but that did not help. Can anyone give me any insight to this?"
The response from lz3broc was:
do you have an autosensing router switch?
has anyone tried to reset the router?
did any of the computers have recent OS upgrades?
There was no answer for me there as the situation "magically" resolved itself.
Now to my situation: The only thing different is the computers and sotfware seem to be working fine, and all will print to the network printers. It's just connecting to each other, the Internet and incoming mail.
I don't know about the router, it is fairly new - Cisco Linksys SD2008.
We did unplug the thing and shut everything down.
YES - we did update the OS from 10.4.2 to 10.4.11 last week and everything has gone downhill since then. I did the check disk and repair permissions on these computers too.
Can anyone provide any insight as to what we can do next here? By the way, the outgoing e-mail does work.
Thanks,
Kim

So I came in today and this is what I had:
Mac 1 working fine, Internet, E-Mail, printers, cannotlog on to other hard drives on network.
Mac 2 - No Internet, E-Mail and will not print.
Shut everything down thinking I could just move the 200 Gig from Mac 2 to Mac 1 and be on my way. Hooked 200 Gig to Mac 1 and booted up. Now, neither Mac 1 or Mac 2 has Internet, E-mail or can print.
Shut everything down, unhooked the 200 Gig completely.
Started Mac 2. Mac 2 now has no Internet or E-Mail, but will print.
Started Mac 1. Mac 1 now has no Internet or E-Mail, but will print.
Shut down. Hooked the 200 Gig to Mac 2 and started up.
Same as above. Mac 2 now has no Intenet or E-Mail, but will print.
Mac 1 now has no Internet or E-mail, will not print.
It seems every time I do something, I I get different results. Sometimes on Mac 1, I get I get a window that says: "AFP Connection Status: Looking up Mac1's computer. Connection failed - server may not exist or not operational at this time." Does AFP have anything to do with this? I am out of ideas.
Thanks.

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