All good appreciate every ones input.
Anyway, different plug on the wall, different power cords, different power board, same issue :-)
The A500 is back together, lid on still does it. Go back to my s-video adapter and it's fine, a shame as it's much better picture quality with the indi (apart from the wobbling about and screen tear ;-)).
Anyway that's enough for now going to go do something else and come back to it.