I'm not sure if this will help, but could you please put "set debug=all" (without the quotes, of course) at the top of /boot/grub/grub.cfg, reboot, and say whether there's anything interesting on the screen? If there is, perhaps a photo of the screen would be useful.
I'm not sure if this will help, but could you please put "set debug=all" (without the quotes, of course) at the top of /boot/grub/ grub.cfg, reboot, and say whether there's anything interesting on the screen? If there is, perhaps a photo of the screen would be useful.