Cannot connect to internet with ubuntu 11.10 wired connection

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http://askubuntu.com – I installed Ubuntu 11.10 on my Dell Optiplex 745 today. I could not connect to the internet with the LiveCD, but I installed it anyway. It still doesn't work. This is the first time linux has been installed on this computer. Windows XP connects with no problem. I have a Broadcom NetXtreme 57xx Gigabit Controller. I have tried removing Network Manager and using dhclient but it doesn't work either. I also tried Code: modprobe tg3 and then Code: dhclient eth0 The last command runs forever. I dont know if thats good or bad. when i do Code: ping google.com or try to open a page with fir (HowTos)