My 2007 C class W204 220CDi has twice now not started when turning the key. It happened many months ago then again this week. I wondered if anyone else has experienced this? What happened was I turned the key to pre-heat the engine, all dash lights as normal. Then when turning the key all the way to start nothing happened. I then turned the key to off, tried again and still nothing happened. On the third attempt it started perfectly has been fine since. So two occurances at least six months apart - but slightly worrying. The car is due for a service soon but I'd like to know if any other W204 owners have seen this before I speak to the garage. Thanks.