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Most microwave ovens are like computers, they lock up and ocassionally need to be "re-booted", or re-powered. 1. Simply unplug the oven, then wait about 10 seconds, plug it back, and check to see if has unlocked itself. If not, continually press the clear or reset button. If that doesn't help, you'll have to get the model number and manufacturer from the label inside the microwave oven.
My Kenmore Elite microwave (don't have the model number in front of me) also mysteriously locked its own keypad (we were sitting in an adjacent room, heard a strange beep, and got up to find the LED reading "Locked."). I pressed and held down the Stop/Clear button for ~10 seconds and it returned to normal.
By high-pitched, you mean it is not that same frequency as when it's cooking?
Is the tone near or the same as the beep you hear when you press a key?
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