I have Lion installed on my 2011 Macbook Pro and was trying to boot the computer from a 10.5 disk and get some kernel errors on the screen when doing so. This was booting while holding C at boot and also via the installer and reboot when in Lion. Does anyone know if this is possible? I'm trying to boot it up via the 10.5 disk so I can install 10.5 on a USB flash drive. Thanks.