I'm using a Dell Precision 490 and recently had the entire computer wiped due to viruses, had the OS reinstalled and am in the process of setting it up again. I have connected to the LAN at my office but can't get the computer to connect to the internet and all the built in troubleshooters and diagnostic tests can't find anything wrong with the connection. I have manually entered the IP and Gateway addresses and the DNS addresses for our network but still can't connect. Any ideas?