ethernet problems in ubuntu 12.04

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http://askubuntu.com – so today i popped out my hdd with ubuntu on it and put in a fresh hdd and installed win8 (wanted to try it). i got everything installed, upp and running and decided to go back to ubuntu (for obvious reasons lol) but when i boot back into ubuntu my internet connection will not connect. i booted into a live cd of ubuntu and it still would not work. i thought i blew up my onboard port so i booted back into win8 and the internet worked without flaw. so i booted back into my ubuntu install and i have a usb to ethernet adapter that im using but i still cant get my onboard to connect. any ideas? lsp (HowTos)