A couple of months ago my kids' 2007 24/2.4 iMac stopped working. When I pressed the power button I could hear the fans start for a split second, then nothing. After some searching, I determined that it was most likely the power supply. As you can imagine, something as old as this was hard to find cheap parts for, but I found a 2008 24/2.8 power supply along with everything but the HD, optical drive and display. So, I swapped my HD and optical to the new chassis, dropped the LCD in and fired it up. I was elated to hear the startup chime and see the Apple, but then the progress bar would stop about half way and it would shut down. As it sits I can boot into single user and recover modes, but not safe mode. The disk cannot be verified or repaired using Disk Utility or fsck. Am I just hosed? Or is there something I'm missing? Thanks!