Getting to a console at runlevel 5

[Jonathan Singer]

I broke something in X, and booting in runlevel 5 gets to an unusable
screen. I can't get to a virtual console and am wondering what the next best
way is to get to a text-only screen from which I can start troubleshooting.

This is on a TiBook, dual booting OS X and starting Linux from yaboot on a
separate partition. No services running that would allow me to edit or
replace inittab from another system.

I'd appreciate any suggestions! Thanks!