Currently Being ModeratedMay 2, 2011 8:19 AM (in response to joel236)
Reset the PRAM http://docs.info.apple.com/article.html?path=Mac/10.6/en/26871.html - please post back with results,
Currently Being ModeratedMay 1, 2012 9:31 AM (in response to MGW)
Try the recommended stuff first (search other posts). I had this problem just yesterday after installing new memory. Nothing worked. Since I had a backup of my important documents, I decided to reinstall my system from the original disks and my wireless came back.