Can't boot without USB...

Hey all,

I'm having trouble booting into El Capitan without booting from the USB. When I go to boot from the SSD that El Capitan is installed on, it gets to the Apple logo with a progress bar and the progress bar goes all the way to 100%, and then it goes to a black screen and nothing happens.

Ran Multibeast after the install, set up my BIOS settings like it says to do in the Install thread, etc.

Is there something I'm missing?