Maytag DW wont start

My Maytag DW (model MDBH989AWB1) will not start. All buttons light up when pressed. When start button is pressed, it lights up for about two seconds then starts blinking. I ordered replacement control panel (W10810424) and installed it. Same issue. So I ordered replacement control pad (W10298356) and still same issue. I have tried old cont pad with new cont panel and vice versa with no luck. I had to replace control panel about 18 months ago as the start button wore out and had become inop. Unit is about 6.5 yrs old. Please help - so sick of washing dishes by hand!