I need to thank Apple for inventing Time Machine, it really saved my (digital) life today! Despite having a bad feeling, I decided to proceed with the upgrade from 10.5.4 using the Combo Updater (after repairing the permissions and doing a fsck). By some strange badluck, my iMac decided to crash while the installer was writing files and I wasn't able to reboot. At each attempt, I got a kernel panic immediatly after some terminal garbage was displayed. Safe boot did the same thing, and I couldn't even boot in single user mode (terminal).. All I got was:
I inserted my Leopard Up-to-date DVD to do an Archive-and-install, but after looking as if it was going to work, I got a strange error message..
I tried a couple more times and after a while, I could no longer boot from the DVD! It would eject it as soon as I tried (I tried pressing 'C', the 'Option' method and the 'Cmd-Opt-Shift-Del', all failed). I then looked for my original install disk, and after it refused to boot from it a few times, I finally managed to reinstall everything (there wasn't any option to preserve users's files and setting so I lost everything - fortunately I had done a backup minutes prior to updating).
I'm not exactly sure of what happened, nor why it didn't want to clean-install from the Leopard DVD. It sure made me nervous when it couldn't boot from anything!
The good thing is, thanks to Time Machine I'm back to normal as if nothing had happened
