alexanderpaul

I own a 2005 A6 saloon 2.4 multitronic Audi sport. Sometimes when I turn the key in the ignition, the car doesn't start. There is a tiny click sound but this is definitely nothing to do with a battery failure. I recently took the car into a local dealer who were unable to replicate the problem, so nothing was done. I also swapped my regular key for a spare one but this has made no difference. Any ideas please?