Just started having this problem. My iMac and iPad will not connect to internet, my sons' MacBookPro, iTouch and PS3 will. My iMac is wired to the router direct, my iPad, of course, is WiFi. The MacBookPro, iTouchs and PS3 connect through WiFi. I don't think it is a router problem or a modem problem (have Cable internet). What could be the problem? The iMac and iPad seem to have minds of there own, will connect sometimes and then sometimes will only go to certain websites. This is driving me crazy. Any help would be greatly appreciated.