Can anyone assist, I have bought myself the Seat equivalent of the RCD310, the stereo has come from a 2012 Leon, I have taken out the original stereo from my 2008 Altea XL with no problem, hooked up the new one, nothing displays on screen, I know it has power as the eject mechanism sounds when I press the button. I swapped the fuses around on the stereos and still no joy, anyone have any ideas?