Does it seem like the unit is actually responding in any way when you press another key?
It sounds like a shorted keypad, like the Power key is shorted.
This can be due to wear or moisture, most often from cooking steam or spraying cleaners directly onto the keypad.
You may find it's not economical to repair this, as parts may be unavailable separately.
If you have the manual, you can contact their support line to see.
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