Try jump starting it with another vehicle, and drive to your local auto parts store that does free battery testing (most chains do). Check for corrosion at the battery connections. I doubt any dealer analyzes your battery charge holding capacity when you're in for service. It's also very possible for all lights to work and the starter not to turn if there's not enough punch left in the battery. It's also possible that it's entirely unrelated to the battery, but that's where I'd start.