So I have an iMac that I purchased several months ago... Today I was installing my system update and decided to just skip it and watch a movie, and update while I sleep, I turned off my iMac while the update was at 15%. Silly me. I reboot and there is an error screen that says please reboot. I reboot, and it comes back to the error screen. I try to reinstall OS X Leopard with my DVDs, the first disk installs (but somehow it doesn't ask if me I want to archive), but the iMac doesn't recognize the second one. I tried to repair the disk, but when I boot OS X the error screen still appears. I also tried booting in safe mode, that didn't work. How can I get OS X working and keep my files?