Is the battery charged now? Have you been able to start the car again? I'm not sure of the detail of a Starmark warranty and what exactly it covers, but it sounds like you either have a battery that won't hold a charge or there might be something wrong with the charging system. I would think that MB should remedy this problem for you.

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Jason Priest
1999 E430
1995 E420 - retired
1986 420SEL - retired