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Time to get the radio out of the dash and check the connections at the back to make some sense of your problem.
Take a look at this link :-
TLCDCEmu - Hardware
A4 has a constant 12 volt , this holds the memory and code.
A7 is controlled by ignition switch i.e. 12 volts only when ignition is on.
With a meter check the voltage on A7 and you should see it go on and off with the ignition switch....if not there is the problem.
hope this helps.
Currently in Getafix's garage:
clean and shiny Scenic 2 1.6 16v Auto. (and a Fiat Campervan).