Hi, It looks like the hard disk in my 1.5 year old iMac (24" 3.06 C2D, running 10.6) suddenly failed today . I woke the mac up from sleep and pretty much immediately I got a spinning beach ball. The system was totally unresponsive so I did a hard reset. Unfortunately the blinking "?" folder came up on the gray screen, instead of the familiar Apple logo. Booted off the OSX disk and ran Disk Utility. The harddisk comes up as "media" and unrecognized by the system. So no First aid or formatting possible. I'm guessing the hard disk has given up but before purchasing a new one I want to rule out anything more serious like motherboard issues. Any advice on what else it could be, and what I can check to be sure? Thanks!