I have a MBP and Mini as registered computers with my dotmac account. Got an iMac last Friday and have been unable to register it to my dotmac account? I don't remember a two mac limit? Any ideas would be appreciated. I open the system preferences and select dotmac and then choose advanced ... usually I get a greyed out option of registering this computer, I select done and then reopen advanced and have the choice to "register this computer." but it does not, I get the spinning circle indicating that it is trying to register ... but it never completes or ends ... ?????