Let me preface this by saying that I am a switcher -- this is my first Mac, but I am reasonably computer-literate in Windows world. I'm taking my Mac to the geniuses tomorrow for a probable return/replacement but want to see if anyone else has experienced this (yes, I searched). The problem: my brand new iMac is shutting down when I attempt to install Office '04 from a CD or access a file on a CD. I received my new 20" iMac yesterday (wireless mouse, the rest is stock) after waiting since last November for the new generation. After turning it on and playing around in Safari, I inserted my just-purchased Microsoft Office 2004 for Macs to install. It appeared to be going fine, but then the computer just shut down -- no freezing, no other indication of a problem. It went through this pattern a few more times, varying the shutdown point from immediately upon the CD loading to during the actual install. I spoke with Apple Care and the tech took me through a few different exercises, including loading the OS X install disc 1, which also caused the computer to shutdown. The tech believes this is a problem with the superdrive, which sounds logical. Anyone else experienced this or know of any other likely culprits? I am not looking forward to giving up my Mac after only a day of use, especially since it means driving 2 hours to the nearest Apple store and probably being without a computer for the next week while I wait for a replacement.