Internet connectivity through client computer on home LAN

I have small network at home that includes 4 computers.
Someone played around with one of them and I lost all
connectivity to the resources and internet. I reconnected
the troubled computer by putting in all IP addresses,
etc. Resources to the server computer were now
available. Problem I'm having is that I still cannot
connect to the internet with my troubled computer. It
basically cannot find the server and tells me to go to
Internet connections and and check off Automatically
detect connections. Nothing seems to work...Pls
help.....thank you.