download and burn freeBSD fixit disk (live CD)
from there you can start console....
how exactly did you install FBSD?
did you used custom install > minimal distribution
or custom install > custom > base + kernel... distribution
i think you need to read
http://www2.lv.freebsd.org/doc/en_US...k/install.html
if you haven't done so already, if you have, reading it once more, might be of use