Hi guys,really really need your help....

I took my powerbook away, and was using it on wireless networks without a problem. Since I have come home,however,it won't find my home wireless anymore. All the other machines in the house find it without a problem, but the powerbook won't even see it to try and connect to. Its as though it has 'vanished' according to the laptop and that I don't have a wireless at home anymore.

Any ideas?! neye: