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Sounds like a bad keypad. You will need the full model number off the microwave to look up the correct control panel part number. Sometimes these type of parts can be really expensive & it may make more sense to replace the microwave depending on the age and condition.
Does the display on your microwave read "Locked"? If so, then the Child Lock feature has been activated. To toggle the lock off, press and hold the Stop/Clear pad for more than 4 seconds. When this feature is active, most buttons are disabled to prevent accidental microwave use.
The Sharp Microwave/Convection oven I have says to touch the Custom Help button, the number "1", then touch the Start Button. To turn off the child lock, press the Stop button.
Or just unplug it, wait 1 minute, and plug in.