Stuck with "GRUB loading." after upgade.

Did a upgrade of OpenSuse 13.2 to Tumbleweed, and now the computer freeze with a black screen with “GRUB Loading.” on top.

Booting from USB-stick (with installation-image) and selecting to start linux-system from More-menu works).

I dont know where to start searching…

I have tried “grub2-install /dev/sda”, but it don’t solve issue.