I was at my friends house yesterday with my MB and my computer could not detect a WIFI network, even though there is one. My other friend that was there could not find a signal on his iPhone. Then the owner of the house said she has a friend with a MBP who also could not detect the network. everyone with a PC laptop could find it instantly. The only way to connect to the network is to type in the networks name to search for it, then it instantly connects. Also the same thing happens in my friends dorm where everyone with a mac has to type in the network name to detect a signal. What could be the issue with macs not finding certain networks? Other than these two places my MB has no problem finding wireless. Thanks!