Hello all, I'm after some help.

I have a 2012 GTC  that I bought a few months back and had a new head unit professionally fitted. The car doesn't get used much and the (very old) battery went flat. It was jump started a few times with a power pack and there was nothing wromg with the stereo.

Then I fitted a new battery. The stereo was working right up to the battery change. Now it is as dead as a dodo as is the top display and the indicators no longer make a noise.

I have seen that othe