I have a strange experience. I have been wirelessly connected to the internet for months without any problem. Recently, the Airport icon on the menu on top of the screen stopped to show a signal and started to tell me Airport is Off. When I go to InternetConnect, it tells me there is no signal. I try to find my network, but no network is available. The status of Airport is not available... My iMac is not connected to the internet through any cable. I also turned off bluetooth. And yet I am still connected to the internet, as if Airport was still working. What is going on?