What condition is the key in? could be that the plastic inside is not making contact with the button on the board, or you need to have a new micro button soldered.
Not always a nightmare, i have an s 500 1999, lovely car, horror stories all over the internet about lots of cars, sure it's not worth alot, but it's my barge, and i like it. air suspension works great, as does everything else, servicing costs- diy, no problems.
You can get replacement screens, or it maybe a loose ribbon cable.
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