I had just gotten a 15 inch Powerbook G4 straight from an apple store. It was working beautifully. I was able to connect to the wireless networks at all of my friends houses. After about a week, while surfing on the internet, I had lost the connection. Not the wireless signal though, It still said I was connected to my network (a fairly good signal), but no internet. My old pc laptop was still working, as were all the other computers on the network. after restarting my computer, My powerbook couldn't detect any networks (when usually there's about 3 of them). But this is off and on, sometimes my home network will show up and then it'll dissapear. Sometimes I'm even able to connect to the internet for a small ammount of time. But it is still really bad. The only time it really works is if I'm in the same room as the wireless access point, and sometimes I even have to be sitting right next to it! But I've found that now even sitting next to it, My powerbook cannot detect the network. Im not sure if it is a problem with the airport extreme card, or the antenna or something, or if its a problem with my computer (I remember the name of the network used to scroll near the airport icon in the menu bar. This doesn't happen anymore...) I've tried reseating the airport card, no help (I probably just broke it even more...), I've updated all my software, and I ran norton virus scans etc., soo... I don't know... I have the applecare protection plan but I think that's a last resort for me, I don't feel like taking my laptop back to the apple store and waiting who knows how long it takes for them to fix it. Sooo, any help is greatly appreciated!