A small "L" on the display pad indicates that the microwave is locked.
On some GE microwave models you'll need to press "5" and "7" simultaneously for 3 seconds, rather than CLEAR/OFF.
If there is no "L" visible on the display, following Step One will turn the child lock-out switch on, which will activate the "L" indicator on the display.
Modern microwave ovens are equipped with automated electronic controls that allow users to push a single button for cooking a bowl of popcorn, reheating a slice of pizza, heating up a baked potato, or simply rewarming the morning coffee. But those controls might be dangerous if operated by a preschooler, and that's why GE has built a child lock-out function into their advanced microwaves. Easy for a grownup to both lock and unlock, the safety feature ensures that a GE microwave oven is not started accidentally by a child.
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Press and hold the "Clear/Off" button on your microwave oven's keypad for about three seconds.
Wait for the "L," which indicates the microwave is locked, to disappear from the display.
Open the microwave using the open latch button.