How is it possible that when I do have a Wifi connection, I cannot connect to Safari or Google Chrome or anything else internet-related?

How is it possible that when I do have a Wifi connection, I cannot connect to Safari or Google Chrome or anything else internet-related? Sometimes it does all work, but after a while Wifi is still there and I am not able to go to any website whatsoever.

Your network preferences file may be damaged, that would explain why you can configure the computer and get online but then when the computer wakes from sleep and needs to restore the setting it cannot.
Open the Library folder of your computer (not the Library in your user directory) and then find the Preferences folder. Now the problem for me is that I've not used Leopard forever so I'm not sure exactly where the file you want is or what it is called. In Mountain Lion it is called:
com.apple.airport.preferences.plist
and it is inside a folder called SystemConfiguration. But I can't remember if this has changed along the way or not. The easy thing to do is to go back to the Network Preferences pane again and make the change I directed above. Then you can look in the Preferences folder and sort by date modified to find the network preferences file that was just now modified. Move it to the desktop, restart your computer, reconfigure the WiFi again and see what happens.

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