In preparation for the release of Lion, I'm trying to get my new (used) iMac up to snuff with Snow Leopard. I have the box set (iLife & iWorks) installation and my iMac is an Intel 2.16 GHz Intel Core 2 Duo with 1GB of memory running 10.4.11 Tiger. The iMac reads the disc, opens up the installer, but doesn't actually run the installer. Just reboots my machine back to the 10.4.11. I've tried holding down "c" to boot the DVD drive at reboot. I've tried holding down option during reboot to be able to select the DVD drive to boot to (the DVD drive doesn't load) and I've tried changing the Startup Disk in System Preferences. Thoughts?