I have been using an airport extreme now for about a year on the "G" network I believe. Recently I have been trying to change over to the 5ghz mode. When I hit the reset button in the airport utility to make the change, the airport eventually says that the changes have been saved but the computer cannot connect and the network is not available. I have a Mac Pro dual 2.66 and should be able to utilize the 5ghz if i am not mistaken. Any suggestions would be greatly appreciated.