I've got a 2005 Plate Audi A3 Sport, which I've had for roughly 3 weeks. On a few occasions since I've had the Car, I've come out of the house to find that the Car won't start. It unlocks fine, Stereo will work fine, along with the Lights, Heating, etc, & you can hear the Car trying to turn over, however it just won't start. When this happens, there are no lights or Symbols displayed on the Dash at first, not even the Mileage or the Time & Date, etc. If I turn the ignition off & try to start the Car again, all of the Symbols on the right hand side will appear for a few seconds & will then disappear, the Computer will come on where it displays the amount of fuel left in the tank, etc, but nothing else. If I disconnect the Battery & then re-connect it a few seconds later, the Car then starts fine & everything appears on the Dash as it should. Any ideas because I'm completely baffled by this.