When a residential microwave oven completely fails to respond when you press the start button, the malfunction is typically caused by a ribbon cable disconnect, a failing tactile switch membrane, or an active child safety lock feature. Many modern microwaves feature a safety lock that disables the keypad when engaged. If the buttons remain dead after disabling the lock, the control board or membrane switch has likely failed. You can troubleshoot control lockups easily by unplugging the unit for two minutes to perform a hard reset. You can verify that your corrective action is successful when resetting power, unlocking the child lock, or replacing a faulty touch control interface panel restores normal button responsiveness across the keypad.
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