Went to start the car this morning - dashboard lights, radio, headlights all work, but nothing when I turn the key - not even a click. Audi dealer recommended jumping, but the battery shows as fully charged, and doesn't seem to be the issue since all lights have power. Before I have it towed 70+ miles to the dealer, I was hoping there might be something simple I could try ... Car was fine yesterday - but did drive through some heavy rain. Suggestions?