Do you get any codes, it will scroll across the screen if it a bad DESS port/key or something, you my have two different problems or use another doo key to see if you get a code and if no start check across the relay once you get 2 beeps with a volt meter, my 2nd Doo just started this late summer the same thing 1 beep, error code (same code) but it will start, my 1st Doo did same thing last year i replace with a new DESS key and now i get 2 beeps all the time now.