Mac mini wont connect to internet...

says IP address is in use somewhere else???? it will connect for a few seconds then gets shut off. i think this happened once before...a friend was able to help me change something in the network settings but he wont wake up and i'm at work being completely UNPRODUCTIVE.
and also taking up someone elses computer.

If you get a report that the IP address is already in use, it means either that you have the wrong settings in your network preferences, or that you're using a router that isn't functioning correctly.
Go to the TCP/IP tab for the connection type (Ethernet or AIrport) that you're using on the Network Preference pane. If you're using a router that hands out IP configuration, make sure that you have 'Configure IPv4' set to 'Using DHCP'. Then click the 'Renew DHCP Lease' button. It should then populate the network preferences with IP address, subnet and router data.
If you are using manually assigned IP configuration, then ensure that is set rather than using DHCP, but ensure the IP number you then enter is not already assigned to another system/user.
When you see the error indicating the IP is in use by someone else, your system will typically set an internally assigned IP number (starting 169.......). This isn't valid for internet use, and the system will disconnect from the router/network due to the conflict - that's why it connects for a few seconds and then stops.

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