Hi, I am brand spanking new to the Mac world - just bought a MacBook a few weeks ago. It has been working great (despite me still feeling a lot lost on my of the short cuts). This morning, it picked up a wireless signal without any problems at all and I could connect to the internet and check email, etc.. However, a few hours later and I am an in another location it is says that it is picking up the wireless network, but NOTHING happens when I try to connect to the internet (I'm using a friend PC in the same office to post this). I have tried all kinds of tricks including restarting, trying all the IP addresses available and nothing I do seems to make it work. Does anyone have any suggestions? thanks in advance!