FreeBSD wont boot after restoring RAID 5

[Alvaro Rosales]

Hello guys,
 I had a problem with my raid 5 array and I had to replace one of the
disks, the utility to restore the array worked fine , all the 3 disks
are ok, but the system doesn't boot, I have looked at the contents of
the disks using the fixit  CD and the data seems ok, but I dont know
how to make it bootable again. Is there a way to make the disk
bootable again or I have to make a clean install??.
I only get this prompt at boot time.
boot:

And nothing else happens.
Thanks 4 all your help.