Unplug the microwave oven and plug it back in if it will not start. Unplugging it and plugging it back in resets the electronics of the unit.
Open the door and close it securely if the oven will not turn on. If the door was left open, it may have shut the unit off.
Press and hold the "Clear/Off" button for three seconds if "Locked" appears on the display. Holding this button down unlocks the control panel.
Insert the temperature probe properly into the outlet on the inside of the microwave wall if "Bad Probe" or "Please Insert Probe" appears on the display.