is an 03 plate for example classed as mk3? (i tend to identify the model by the screen part number. probably sad i know). if so, check all the wires where they connect into the screen as they are very flimsy. if you didnt know there is a wire that goes under the outer 'a' post trims and connects at the top. they are that flimsy i have broke a few off simply removing the tape used to protect them in transit from the manufacturer