how to restore boot loader ?

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http://www.linuxquestions.org – Hello, I have installed FreeBSD 9.1, which was working fine, but I made a mistake and I cannot boot anymore, I get "Missing boot loader" when, like usual, I want to boot directly on FreeBSD DD. Here is my configuration : - sda : Fedora 17 - sdb : XP/Slacware14.0 - sdc : FreeBSD 9.1 MBR is on sda, I use Grub2 to launch all my OS (excepted FreeBSD).. I wanted to configurate files in Fedora to boot FreeBSD from Fedora Grub, and I unfortunately put a flag on sdc1 from Gparted, and I cannot boot anymore when I start directly on the FreeBSD DD. So, is this command right to re-install (HowTos)