....and now it's my turn. My wife's PC (Asus H97M-E, Nvidia 750 Ti, Core) wasn't connecting when I ran the updater (including through terminal). So, I rebooted.
Now it flashes the Zorin logo a few times and then blank screen but it keeps flashing on and off. Seems like GPU drivers, no? I tried nomodeset in grub - no luck.
I got to terminal with ctrl+alt+F3 but the monitor keeps flashing and it won't take input except when it flashes on - I can't even get the keys to register unless I catch it when the monitor flashes on which is very difficult.