I'm always surprised to see people try to boot a system after a crash at the installation phase. If a crash occurs, the system is not operational. You need first to fix the thing.
In your case, apparently the obarun-install script do not configure the grub bootloader correctly. So, make an installation again and when the script ask you to install the bootloader answer no. Finish the installation. Now, before rebooting, chroot the new system and try to install grub manually then reboot. To install grub you can follow the Arch wiki
https://wiki.archlinux.org/index.php/GRUB