Hi Spicules,
Well, I don't know if BIOS boot sequence order could influence on the install process and later use. In case it does, I always set is in this oder: 1-USB, 2-CD, 3-HDD
Anyway, it could be simply that your USB has become corrupt when turning your computer off when it crashed after splash, and you need to reinstall the system. This has happened to me on the past, although my error messages were different.