[ubuntu] Internet OK when I boot from CD; Fails when I boot from HD

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http://ubuntuforums.org – Hi, I have a problem and I need some help please. My Internet connection works fine when I boot Ubuntu with the CD and it does not work when I boot from the Hard Drive. It was working then it stopped. I tried to diagnose the problem but I am not familiar with Linux. I opened a Terminal window and entered ipconfig (don't laugh ... sadly, i've been in Windows for too long) ipconfig was something that could not be found in my terminal window so i exited. Next it was System->Administration->Network Tools. I ping'd www.yahoo.com and it said it could not find it. hmmmm. Let's see if restarting the system will fix it. I did a shutdown and when it came back up; same problem. Ok, i really didn't think it would magically correct itself; this is Linux after all. Windows? Well sometimes you can fix things by turning them off and on. Next, another shutdown and I rebooted with the CD instead of the Hard drive and here I sit entering this help question in. I am guessing that a file or setting got changed in /etc/someplace and I am not even sure of that. Can anyone point me in the correct direction? I am assuming that there is a setting which is correct in the CD version that is not not correct in the HD version and somehow i need to find what it is and synchronize it with the CD version. ANY reply would be appreciated. I have no idea how to proceed. Thanks very much, (HowTos)