Reading through the posts, I think i have a similar problem with my '95 E320 Sedan. A week ago the car wouldn't start only 15 minutes after shutting it off, the battery was fine, and it did have a buzzing sound. I replaced the starter and discovered it wasn't the starter, but the relay that fits in the fuse box under the hood's hinge on the driver's side. After changing, it started instantly. the next day the car wouldn't start. All the electrical wires are new. Any advice on what to do next would be greatly appreciated.