There is no "cancel" button: only a pause on the touchpad or an "off" physical button. When it shuts down, no buttons (touchpad or physical) do anything and the light goes out. The vent cover automattically closes, the display says "Finished" and then a single digit code appears where the clock normally displays. I just did five tests, it locked up all five times, and the codes for each of the five occurances were: 1, 0,0,0, and 2.
Is replacing the control board something I can do myself, because I have heard that it costs as much as the microwave is worth to have GE do it.
Where can I get a replacement control board?