It turns out to have been nothing worse than a trapped wire in the back. The garage had their electrics guy remove the headunit and 'fiddle' with the wires a bit. NOw it works beautifully again. The TV screen/GPS still doesn't pop up but that's no biggie. I wouldn't use the gps anyway since I have a Garmin 865 with lifetime updates.
At least I can listen to Five Finger Death Punch as I whizz up the M1/M6 each day.
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