My son installed Snow Leopard on his MacBook, and since that time he has only been able to log onto the internet through ethernet. I am on the same network and have no problems with my MBP running 10.5.8. Network Prefs tell him he is connected through AirPort.

On the menu bar, our home network has a padlock next to it on my son's MB. I checked his Keychain Access app and there was nothing about our network so I added those details to his setup exactly as they are on mind, but to no effect.

Any suggestions?