[Nobody]

I was downloading quicktime 7, all went well, i needed to reboot but didnt immediately as i was using itunes and messing around on internet when suddenly my connectiuon failed. I am no longer able to dind my wireless network a linksys system. I have rebooted powerbook and broadband wifi router which works fine with cable (like at the moment) and osx tells me the airport card port is on yellow. The linksys light is correctly illuminated to show wifi access buit they wont talk to each other. Weird.
I will try the powerbook at my workplace to see if it finds that wireless system tomorrow, but i was wondering if there were any other ideas out there? I remember hearing about a wifi search programme but that may not work under these conditions.
ummmmmm! any help on this and stooopid garageband query would be helpful. thank you all.