hi all, I have just bought a a5 from auction, the mmi isn't working, it dosnt come on when I turn the ignition on, ive tried holding the 3 buttons down, it fires up for about 3 second but then just goes blank again, ive tried it a few times but does the same thing everytime, any ideas please, ive plugged my snap on ethos + in but it wont communicate with the audio or nav, I just hope its not gonna be a dear fix, thanks in advance for any advice at all.