I seem to have a similar problem. I'm attempting to install Ubuntu 13.10 from a usb on a Toshiba Satellite L70A. It's brand new and has Windows 8 (awful excuse for an OS).
After selecting the usb boot priority from the bios, the ubuntu install menu pops up and gives me the options to try or install. Everything looks good at this point. When choosing any choice whether try or install, the next screen is so dark that I can barely make anything out.
I have no idea what to do. Why would it go almost completely black?