Man, that happened to me when i was adjusting my headlights when the knobs, and it fell out of its socket....had to get it baked and popped back in, what a headache.....Well try to move the bulb around from the back to force it in.....oh if that is the problem and its covered under warranty, you one lucky dude! Good luck!

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" Despite its supercar attributes, the M5 still doubles as a soberly practical, spacious saloon - only with the ability to scare four passengers in comfort all the way to the local coronary unit". Top Gear