[ubuntu] awkward black screen can't do anything

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http://ubuntuforums.org – I'm new at linux. I did a bootable usb to install ubuntu. I have windowns 8 and i was going to make a dual boot ok, then a saw some post on internet saying to disable secureboot first, so I did it, then i set the boot to usb, when I restart my computer there was a "no operational system found" i clicked some ESC and ENTER it just repeating, so a I pressed Ctrl + alt + del, it restarted the computer, but now when i turn my pc on there is a black screen with some setences in there e no more things i can't login in nothing or boot windows nothing. it's waht have: GNU GRUB version 2 (Hardware)