Bootloader has broken down.

[djmentos]

I wanted to restore FreeBSD bootloader and run:
fdisk -B -b /boot/boot0 ada0
It didn't work, so I tried to do it with gpart(8):
gpart bootcode -b /boot/boot0 ada0

Now I have black screen on boot. How to fix it?

My partitions looks like this:

# gpart show
=>        63  3907029105  ada0  MBR  (1.8T)
          63  3907029105     1  freebsd  [active]  (1.8T)

=>         0  3907029105  ada0s1  BSD  (1.8T)
           0     1048576       1  freebsd-ufs  (512M)
     1048576  3897591808       2  freebsd-ufs  (1.8T)
  3898640384     8388721       4  freebsd-swap  (4.0G)

/etc/fstab

/dev/ada0s1a            /boot           ufs             rw      2       2
/dev/ada0s1b            /               ufs             rw      1       1
/dev/ada0s1d            none            swap            sw      0       0

 

[wblock@]

Did it have FreeBSD installed before? If this is a fresh install, bootcode is needed on ada0s1 also:
gpart bootcode -b /boot/boot ada0s1