Have my iMac since March and absolutely no problem. Installed Snow Leopard this weekend and worked just perfect UNTIL I turned the machine off. The next day restarted my computer and now takes about 2 minutes to boot up/then when screen comes up it is frozen for about another 2-3 minutes before can start using it. So basically, takes about 5 minutes from start up to being able to use my iMac. Spent an hour on phone with Apple on Monday night--they really tried--but couldn't fix it and now want me to bring to local Apple authorize dealer to work on it. Called them and they think it is the hard drive going out. But just doesn't make sense---worked just fine until I loaded 10.6 and then turned off machine. Before I bring it in and have them open it up and fool with the internal hard drive---DOES ANYONE HAVE ANY IDEA'S WHAT IS HOLDING UP THE STARTUP.