Well, i recently installed Leopard (10.5.1) on my 20 'iMac, all seems to work perfectly but the Airport. I have tried 3 routers (d-link 524) already, but the connection is still getting lower and lower, and then gets totally cut. I tried to change the chanell of the router from 1 to 13, i tried to reboot both, iMac and the router, I tried to do option-command+P+R when booting up, nothing helps. I have 3 PC (XP & Vista) and internet works ok for them, with the same ruoters. Means its something with my Mac here.. Any suggestion on what can i do here?