Ive had my 20" 2.4 for a week now and it just randomly shut down on me. It was an instant shutdown. Just browsing the web and watching a video then instantly dead. It happened the day after purchase as well but I didnt think anything of it until now. I talked to a friend of mine with the same spec'd machine and its happened to him as well today. He actually had his out of the box for a whole 2 hours when it happened to him. Maybe this is somewhat normal? I dunno. I never had a problem with my MacBook Pro like this, hell not even my pismo. Hopefully this isnt a sign of things to come. Has anyone else experienced this?