weird booting behavior

has anyone encountered the following scenario, and if so, how did you solve it (if it was at all solvable, or if it even matters):
–booting into opensuse 13.2 after sudo zypper dup
–grub 2 lists: opensuse 13.2
advanced options for opensuse 13.2
opensuse 13.2 GNU/Linux with xen hypervisor
advanced options for opensuse 13.2 GNU/Linux with xen hypervisor
windows 7 (loader) (on /dev/sda1)
–when trying to boot into first option (opensuse 13.2) boot stops on first verbose screen and hangs there until hard-powered down
–same happens when trying to boot into all of the advanced options for opensuse 13.2
–booting into opensuse 13.2 GNU/Linux with xen hypervisor works flawlessly, no hang-ups whatsoever

just wondering what the issue is here … theo