Intel integrated graphics controllers, such as the GMA950 used by the Intel Mac Mini systems, require some trickery to use widescreen or other resolutions not defined in the VGA BIOS.
Specific Configuration Custom Resolutions
Format disk to two partitions, both UFS, size doesnt matter.Make sure you change the boot type to MBR in the options dialog.
Before you begin, be aware that you might get stuck with the Mac OS X Install Disc in the drive and nothing on the hard drive if you don't have access to a Mac mouse.