I have Linksys wireless router and I bought an iMac about 3 weeks ago. It was almost impossible to get my router to work with my new Imac. Then a Linksys tech person got me to "Clone my Mac address" and it worked. I didn't use my computer for a few days so it went to sleep or whatever. Then the next time I tried to get online it wouldn't let me. It was like I just tried setting up my router all over again. Except that my router setting didn't change at all. Some how after about 2 hours of trying, the diagnostic test worked and I was able to get online again. Is this a problem with AirPort and wireless routers when the computer goes to sleep???? I thought I remembered reading a few threads about this right when Leopard was released, but I can't find them. Any advice??????