Had the same thing. Flashing start button. Turned off the power. Took off the inside panel on the door. Removed the touchpad ribbon cable from the control board. The problem was the broken traces on the ribbon cable. So I went to the automotive store and asked for the kit that repairs the rear defroster grid. It has a paint in there that is conductive. I saw where the traces where broken so I used a really sharp exacto blade (you should consider sand paper) to remove the covering so that it exposes the metal trace. Than I painted the line with a toothpick to make sure it connected the trace. Covered most of the area with plastic and tape so it is not exposed. Turned on the power. Brilliant!!!!!!!!!! It worked like a charm and I saved myself $150.