I am a new user, and I may have completely screwed up my computer trying to install Ubuntu 13.04. I'm working from a liveUSB, and I'm pretty sure I accidentally uninstalled Windows 8 (which is what my computer came with - now the computer doesn't recognize any boot device without the USB inserted), and now the computer simply won't boot. When I start the computer with the liveUSB inserted, I am taken to a page headed "GNU GRUB version 2.00-13ubuntu3", which allows me to select "Try Ubuntu without installing" or "Install Ubuntu," and I've already installed it - if I try to install again, it gives me the option of installing alongside Ubuntu 13.04 or replacing it, so I am pretty sure it installed the first time but it just won't boot. I then used Try Ubuntu and followed the instructions under 2nd Option on this page: https://help.ubuntu.com/community/Boot-Repair
I tried rebooting, and it didn't work - I just went back to the "GNU GRUB version 2.00-13ubuntu3" menu once again. The url from my boot-repair attempt is http://paste.ubuntu.com/6030961
I know this is very chaotic, and I am in way over my head, so any help/advice would be much appreciated!