About 30% of the time on my computer, whenever I launch Internet Explorer, the homepage says, "The page cannot be found." Yet I can type in a website in the address bar and it connects normally. I don't mind, as I don't care much for my homepage (which is some MSN thing or Windows Live or something like that).
Notifications only appear if there is a clear and identifiable problem with the modem, router, physical connections, or signal strength. Since the cables are plugged in and the proper network addresses have been set into place (such as PPPoE), there doesn't seem to be a large problem with your internet connection.
As long as you can get a steady connection and it doesn't drop constantly (thus annoying the living-daylights out of you), your fine
"Whatever the mind of man can conceive and believe--it can achieve." -W. Clement Stone
“If you have butterflies in your stomach, go see a doctor."