Cant boot

Hey guys. I wanna thank the hazard team for all their hard work. But i have a problem, after a succesfull install before i can boot the computer for the first time it computer boots with nothing but a black screen with a white blinking cursor at the top left. Yes i have googled but the problem is i cant even get into single user mode. Any help you can give i appreciate. And btw i'm using 10.6.6i.
-Thanks
Caleb