Boot problem

[Konstantin]

Hi, all!

I have a problem booting freebsd-box.
It stop working about six months ago. Loading stops at the first stage, the
first 20 seconds I still can reboot the machine through ctrl-alt-del, after
that the keyboard does not work.
I boot the system from the installation flash drive, from the bootloader
command line I do the following
unload
set currdev="disk1p2"
read-conf /boot/loader.conf
boot-conf

How I can repair normal booting?

FreeBSD 11.0-RELEASE-p12