Missing operating system message after neighborhood black out

[ritesh parmar]

I posted a message a few days ago with the subject line "Why is Freebsd 
so unstable". I've gotten Freebsd to work after i posted that message 
but now i've got another problem.

I came home today from work and found that the computer had been turned 
off (power went out in the whole neighborhood). I turned on my computer 
and now
i get a "Missing Operating System" message. Both Windows  and linux can 
normally recover after an abrupt shutdown. Can freebsd also recover or 
do I have to re-install it every time the power goes out?