I need a little more information to help you. Is the engine not cranking (starter) or not running? Also, were there any noises or warning lights that you noticed before this happen? Here are two videos you can what that can help us fix the problem:
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.