I connect my Mac Pro via Ethernet (I have airport but it is switched off). The Ethernet port is configured at the top of the priority list (Ethernet 2 is below airport) and have it configured with a manual IP address and my router details. The last few times I have restarted my Mac I noticed that it was several minutes before an internet connection was available. Mail and Safari would fail to connect. Each time before the restart the internet connection was working normally. After restarting and logging in I couldn't even ping the router with network utility yet system preferences detects the cable is connected. Any ideas?