Why does my powerbook suddenly not recognize wireless network-no connection

I did a software update yesterday (EFI Firmware Update, Bluetooth Firmware Update, Java for Mac OSX 10.5 Update 4, iPhoto Update, Safari, iTunes, HP Printers Drivers Update) and now, suddenly, my connection fails. The computer can't recognise my wireless network, while other computers in the house do. I dont know if it;s related to keychains, i've unlocked them, but nothing works. Help? Thank you.

FIXED!
The IP address of the printer had changed. I printed a new Configuration Page from the printer, which contains the IP address. I then entered the new IP address into my iMac. The iMac was then able to 'see' the printer and I can now print.
The HP forums solved this for me.

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