I had a similar issue today. I thought my brand new Rebel had a screen issue, but then I realized it had started raining (or in your case, maybe getting dark), and the headlights had come on. When the lights come on, the radio and dash lights get dimmed to whatever the dimmer dial is set at. In my case, the dial was all the way off (down).
I surmised that when they detailed my car at the dealership, they accidentally adjusted the dial. The screen was indeed on, it was just so dimmed I couldn't see it. Adjusting the dial made the screen viewable again.
User error on my part!