My boss is having a problem connecting to many wireless networks. She has a Power PC G4 and recently upgraded her OS from 10.3.9 to 10.4.6

She has an Airport Extreme card with Firmware Version 405.1 (

She cannot connect to networks in different locations which she was previously able to connect to and can connect to the office network but with a very weak signal.

Any suggestions for how to correct this problem would be appreciated.