Dishwasher is 3 or 4 years old - never had a problem. Now it won’t start - the Start button blinks and nothing else happens. I Googled and found a diagnostic to press a sequence of buttons to reset the control panel and that didn’t work. The Start button still blinks. I didn’t check to see if it’s blinking a certain number of times. Any suggestions? I am NOT technically inclined. 
If you aren’t mechanically inclined call an appliance tech.