Okay, this is ridiculous. I have one of every type of the newest Macs: MacBook, MacBook Pro, MacBook Air, iMac, Mac mini, Mac Pro. Since upgrading them to Snow Leopard, none of them will connect to any wireless network -- regardless of the router (AirPort, Linksys, Cisco, etc.) and regardless of the type of security (open, WEP, WPA, etc.). Every time I attempt to connect, I get the message that the "connection failed." Here's a 20 second screen recording of what's happening. Any ideas?