When I finish using my laptop each night, I gently close the lid and shut my eyes. When I wake each morning, I lift the lid, press the power button, and return to where I was working. (Been doing this for years.)
But GRUB failed to offer a boot option, and instead kicked me back (automatically) to the BIOS .. in an endless (tho very short) loop. Sukage maximus.
Not much you can do when the boot loader fails to offer an option. I tried powering-off the laptop & powering it back on. Still no dice. "This ain't good," I muttered, wiping the sleep from my eyes.
As part of the installation, Ubuntu automatically installs a copy of the GRUB boot loader, which has worked flawlessly .. (uh, until today, that is).
My hard drive is pretty new, so I didn't think it was a problem with the drive itself failing. So maybe GRUB somehow got corrupted, I thought .. tho I did nothing that should've affected it. I mean, GRUB sits in the Master Boot Record (MBR), and I have no reason to go there.
I'm not even gonna say how long it's been .. cuz I'm kinda embarrassed .. especially since Radified is very much about backing up your hard drive (with industrial strength Cloning tools).