Seems like I have tried, everything, from changing router to WPA, messing with the settings under network preferences. Apple support on the phone cannot help me, I exhausted all the options they have to say. I am trying to hook up my MacBook Pro to my home wireless which uses a Linksys router (Model #WRT54G). The MacBook recognizes my wireless network but by airport under network preferences, the dot is yellow and it says no IP address. I take that is the problem somewhere.