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my car won't start for some reason. I haven't used it for about 3 days and it already seems to be dead. I'm a bit lost because I was told my a mechanic and an AA Inspector that my car is in good condition, I've recently had it serviced and got my car battery replaced so not sure what the problem is ???

Hi there,
Until the cause of no start is determined, it is difficult to come to a conclusion. Something could be left on and drained the battery (interior light?). The starter motor internal contacts could be a bit worn-battery could have just failed- car gear selector could be not quite in Park or Neutral- spare key not activating the immobilizer..