Hi very new on here, bought a used A3 in Jan, very soon after purchase the instrument panel lights started to flicker, then on starting from cold wouldnt come on until 10mins or so after flickering. the other day I started the car and stopped at the local shop to buy a paper was in there 2 mins and the car wouldnt start, completely dead, no power at all, my friend tried to jump start it but nothing at all checked all the fuses 5amp,10amp,15amp etc but not a sausage....the central locking and radio are dead also would anyone be able to give me some tips please????