[ubuntu] trouble connecting to internet

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http://ubuntuforums.org – Thank you for your help I am using a netgear router to connect to the Internet. O/p ubuntu 12 new motherboard gigabyte new cpu AMD old hard drive from older build 1) cannot connect to Internet when I come straight off my Time Warner modem. 2) Connects when I plug into the netgear modem I am fearful the netgear router is about to fail and I am not sure why I can not connect straight from cable modem. When I use O/p ubuntu 10.?? 1) cannot connect to Internet at all. Using o/p ubuntu 12 and this command. lspci -v 02:00.0 Ethernet controller: Atheros Communicat (Hardware)