depending on the distro being used to install, different kexts are loaded as default in the mkext. better to use "-f -x -v cpus=1" when booting an install DVD as you don't need to draw full support out of your hardware to install. by full support I mean you don't need everything that safe mode (-x) doesn't include. the boot flag "-f" causes the boot sequence to ignore the mkext that was originally created and used in place of the Extensions folder (with all the rest of the kernel extension files in it) so you would get better hardware recognition at boot from those kexts. also, you don't need the system recognizing more than one processor during install, this will be found and be used normally when you've installed and are running the system (if you have the right kernel selected with the correct customized "drivers" as well). That being said, don't forget the "Customize" button right after you select where to install OS X to.

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