Whirlpool MH7130XE Microwave Oven "start button stove top mean" Questions

...Still beeps periodicaly. The light works inside the oven. The buttons do not work. No light on top of stove. No fan/vent ontop of stove work. What "F3" mean???? probably a defective ...

...start with. I just called Samsung and the tech support person I spoke with said mine (was purchased in 2010) was manufactured during a time when there was an issue with the circuit board, so they ...