Network Diagnostics gives green lights, but machine still won't connect

I am using a AE(N) base station and wireless network, and as far as I know, no settings have changed. My mac mini has an IP address can send and receive mail, but neither Firefox nor Safari can load any webpages and apps that try to connect like software update don't recognize a working connection. Network Diagnostics give me green lights all the way through "Server" and multiple other machines still work on the same network. I have removed the network login info from the mac mini and erased the mini's connection access from the base station and started over. Mini has no change, and the other machines are still fine. I tried creating a guest network and connecting to that, but it didn't help. I'm running out of ideas to trouble-shoot the problem. Any advice is appreciated.

mblatchford wrote:
I am using a AE(N) base station and wireless network, and as far as I know, no settings have changed. My mac mini has an IP address can send and receive mail, but neither Firefox nor Safari can load any webpages and apps that try to connect like software update don't recognize a working connection. Network Diagnostics give me green lights all the way through "Server" and multiple other machines still work on the same network. I have removed the network login info from the mac mini and erased the mini's connection access from the base station and started over. Mini has no change, and the other machines are still fine. I tried creating a guest network and connecting to that, but it didn't help. I'm running out of ideas to trouble-shoot the problem. Any advice is appreciated.
In the Network panel of System Preferences, if you click on the "Advanced" button for your AirPort connection, then on the "DNS" tab, what do you see for "DNS Servers"? How does that computer with the same settings for the computers that are working?
What do you mean by the statement that "I have removed the network login info from the mac mini and erased the mini's connection access from the base station"?

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