[ubuntu] Ubuntu 14.04 stopped working, and can't fix.

I am 100% newbie to these forums and don't know how to approach this bug. But basically, won't run. Worked perfect yesterday and was the best Operating system I've ever used. I know It's more than just an OS.. But unfortunately, it stopped working last night with 'low graphic mode' screen. No options worked, and two of the options (low graphics for just this session and something else.) Just led to unlimited boot screen. Next day, figured out how to open Terminal so I did that, but I also tried to open GRUB (didn't work for some reason, tried everything.) And followed some steps on how to fix the screen with Terminal. (Pasted code into the console.) And BAM! I think I just bricked it.. In short, the operating system WILL not boot, I've tried opening the Terminal, but another screen with a blank _ appears faster than I can type in any other stuff. Again, can't open GRUB because none of the shortcuts work despite holding shift, c, space, del, etc. The only thing that worked was ESC which wasn't GRUB, it was UEFI. So I figured I would try to boot from flash, tried different boot order and legacy mode, and it FAILED! I have no other options now because literally nothing works. so I am at another PC in hopes I may find a solution, not very successful thus far. So I sized up for Ubuntu forums... Pls help, Here is what it looks like: https://www.youtube.com/watch?v=_Ti3...ature=youtu.be (Sorry for uncay video.) And P.S, I did download this OS because of educational purposes. So far, It's wonderful and is worthy of my main OS.