OK, here is my problem: My collection of computers is as follows, iBook, PowerMac, and Powerbook. All are running the latest updates of Tiger. All of them access the internet through my airport extreme network, which is augmented by an airport express. Now, my iBook and PowerMac all access the internet w/ no problems, but the Powerbook either outright refuses to do so, or will connect for a second, then nothing. I should note that when I say connect...the airport signal is always pegged out, but when I use the Powerbook, its as if the broadband isn't there, but the iBook and Powerbooks are fine. I have checked the settings on the computers....they all seem to be as they should be...I have rebuilt permissions on my Powerbook...I have restarted my basestations...I have restarted my Powerbook...stil the same behavior. The only thing I can think of is that I accessed my University's wireless network with my Powerbook while I was in my office at the Uni today. Powerbook was working fine when I left the house and now nothing...did I inadvertantly screw something up, or did my preferences or settings get messed up when I was logging on to their network? I don't know what to do, can someone please help me?