Report "I've had my 2006 M45 in the shop for over a week. They returned it on Friday stating they couldn't find a problem with it. I drove it home and there it sits as it won't start up again. The "key" light is on. The battery is at full charge (per aaa) and it has a half tank of gas. I got two new batteries in the key fob... I've tried everything. What now?"