Gentoo Installation on Macbook Pro

[Balustrade]

Hi all,

This is my first try at installing gentoo. I've been able to boot the DVD with Gentoo live once, now it refuses to boot. The computer goes through grub on the DVD, goes through a couple of boot screens, then sits on a black screen with a bar flashing in the top right hand corner. Just wondering if there is something wrong with the disc, or if I've made a silly mistake.