yaboot grey screen on both OS X and Debian

[Steven DuBois <sdubois92@gmail.com>]

I attempted to install Debian on my Dual G5 Power Mac and everything 
appeared to go fine, except when i tried to booth Linux and OS X from 
yaboot, both just left me a grey screen.

When I held down option and tried to book either Linux or OS X, the 
result was the yaboot screen for about 20 seconds and then it cut back 
to the OF screen, but some of the colors were messed up.

I asked in #debianppc and I was instructed to chroot to my install and 
run ybin. I did so and it everything worked fine. But, that didn't do a 
thing. After an hour or so of struggling to fix this, I was instructed 
to ask here.

- steven