I've got 130K on my '97 W210. This morning, I start her up, back out of the garage, "Lamp Defective" light comes on. Get out of the car, walk around, all lamps AOK. Think to myself, maybe a brake light or reverse light. I wasn't really paying that close attention when the warning light came on. Shut the car off to see if the fault comes on when I hit the brakes or go into reverse. Thinking I'm a clever fault isolator at this point. But guess what - car won't start. Just one loud click when I turn the key. Not turning over, no series of clicks, one click and that's it. Power is working, lights, radio, etc. Tried jumping it off the family truckster, no dice.

What does this august group of pundits and luminaries think? Could it be the starter? Alternator?

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'97 E320 Black Opal
'86 300E Smoke Silver / Burgundy (retired at 198K)
'63 Austin Healey 3000 Mk II (BJ7) (reluctantly retired)