iMac not connecting to net, all other macs are fine?

[Dynamyk]

My new 24' iMac is recognizing the network but for some reason won't load any pages or anything. I'm posting this from my Macbook without any problems. Any idea what could be wrong?

I ran diagnostics and internet and server are yellow...

 

[bbarnhart]

Do you get an IP address? Can you ping the other machines on your network from Terminal?