We just had a PowerPC G4 Macbook Pro in with Leopard running on it. A bit long in the tooth (especially with 512MB RAM) but working fine nonetheless. Well fine except the WiFi settings seemed to be getting lost each time the machine slept or was rebooted. You’d have to click on the list of available wireless networks to connect to the access point and re-enter the WPA Key every single time.
After much poking about and updating everything we could, we decided to tackle another issue – DVD Player was launching every time the user logged in so we wanted to remove it from Login Items. Off we went to System Preferences > Accounts > “Your Account” > Login Items and deleted DVD Player from the list. We left iTunes Helper and MobileConnect in the list.
This simple act of removing DVD Player from the Login or Startup Items FIXED THE WIFI PROBLEM! Go figure.