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Well as far as I know the "ballast" is sort of a power pack for the xenon bulb which is located behind the bulb itself and connects to it. Which side of the car has the bulb stopped working? as the drivers side headlight can be a bit of a tight squeeze to get to!
its the drivers side m8 plus ill check and clean the relays. this is the one thing i never wanted to go wrong with my car. is it right they are never supposed to go.
Chances are it'll be the bulb that has broken rather than the ballast, and you can get replacement pairs of xenon bulbs for about £20 delivered so they aren't massively expensive, they are just annoying to replace due to the lack of room (I have some in my car as I fancied a white/blue tinted beam) I think it'll just be the ballast connection has fallen off though!
I've seen various threads on here with bulbs going, but they don't go instantly they sort of turn pink in colour then gradually fail (from what I've seen on here anyway)
christ trying to remove the black power pack behind the driver side bulb is a sod i cant even get my hand in never mind move it. can the full light cluster not be removed. also do auto electrics not do some sort of test to identify the fault.