This isn't looking good thus far. Here's my situation; after installing the 10.4.8 update, I proceded to restart my computer. I thought all was well after hearing the start-up sound. However, I recieved an error with a kernel panic with what looks like an issue with the ACPI (APCI Maybe). I've tried going through the installation DVD and repairing the disk, but that however only returns that the disk was not repaired and errors still exist. I also have tried just simply re-installing 10.4 and then importing the existing accounts over, but this also fails early in the installation. I don't want to format my HD as I don't have any backups of my iPhoto galleries. Anyone out there experiencing this? Any suggestions would be greatly appreciated!