Airport issue on MBP

[sir. mac]

Hello,

I haven´t used my Aiport connection for a few weeks and now when I try to connect to my sisters open WIFI-network I get the "unable to connect" message. Also, it doesn´t work when I try to connect after booting up the XP-installation either. It seems I´ve tried everything: zapped PRAM, removed coconut WiFi, refreshed the system configuration folder and com.apple.systemprefereces.plist and reapplied the combo-update (10.4.9).

The only things I haven´t tried is the hardware-test (because I haven´t got the cd here) or connected to any other networks. The router is a Netopia 3357 and the MBP is the 2.16Ghz. But I don´t believe it would work on any other networks, since there is no reason for it not to work here since my sisters laptop can connect easily.

Only thing I can think of is that my airport is broken, or maybe a loose wire.
Should I just hand over the problem to Apple, or try to fix this in some way?

 

[mustang_dvs]

Download iStumbler and see if your airport card is registering her network, or any others nearby. It's possible that an antenna connection popped loose (but only if the machine took a physical shock)... also check your keychain for multiple instances of her network ID (via Keychain Access), as well as in the Network Pref Pane.

 

[sir. mac]

thanks, but I detect her network fine. It is just that when I try to connect I get the "unable to connect to network NN". Also checked for multiple instances on on the keychain, but no.