Make sure you have a fully charged battery before doing anything else. Reset the camera to the factory settings, and insert and format a 32GB or smaller memory card. Follow all instructions carefully and if you are successful, you will see the screen below on your camera.
Pressing the 'Trash Can' button on the back of your computer will bring up the Magic Lantern menu. There will be a few new capabilities available to you, courtesy of the programmers at Magic Lantern, and in the not too distant future, the new features will include RAW video.