My 2010 Mercedes s400 will not start. Everything lights up on the dash .

What is your question?

I drove my Mercedes s400. Got out of the car then came back 15 minutes later and it will not start. The dash board will light up. It shows a triangle with an exclamation mark. It shows what looks like the transmission. The lights are not dim. But it will not start. Help. The dealer said it might be the hybrid battery. What seems to make the problem better or worse? Never had a issue it just happened