My first MB, perfect CarFax by the way save one window regulator. Has about 118k miles. One year into ownership, the car began not starting immediately upon turning the key. I wasn't sure if it was under the hood or the key as sometimes it seems as if "wiggling" the key helped...but that's not scientific. At any rate, it would always eventually start after at most five or six tries.

Until yesterday, which was also one of our first 40 degree (F) days here in South Central Texas, when it wouldn't start at all. Just a click. Everything electrical inside is turning on-- lights, A/C, radio, etc.

As far as I know, this car might have the original battery on it.

Where do I start? Thanks in advance.