I'm on my late 2011 iMac that is running Mavericks 10.9.3 and I haven't been able to connect to wifi for about 3-4 weeks. I have tried everything and it still won't work. Any help? I know for sure that it's not my internet connection I also have another iMac that is running snow leapard and that one works fine.(it's not mine I can't use it). Someone please help me out!