Network/ethernet problems

Hi. Constant problem, every single time I turn on my computer it has no internet, but then I click on 'network' in the system prefs and a window jumps out to say "new port detected.....Built in ethernet" every single time! Click ok and then it finds the connection and we're cooking. But what can I do to fix this?
Now to my knowledge I've not altered any settings, my internet (direct plugged in cable through set top box) has always worked fine and this problem just started up about a month ago. Is there any other info needed for someone to answer? Thanks a million in advance.
Dan

You may want to consider booting the installation CD, starting 'Disk Utility' and doing a 'Repair Permissions'.
After that, reboot into Safe Boot, http://docs.info.apple.com/article.html?artnum=107393.
Then reboot again and see if it starts behaving (you may need to go through network config one more time to know for sure).
Wondering if a preference file isn't getting written due to a permissions issue.

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