That HUM is your fuel pump turning on and priming the fuel line. Just a guess or two, check your fuses (inside and under the hood), or maybe somehow the sensor that sends a single to the car saying it's ok to start has a fault, in the pedals maybe?
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2017 Ford Focus RS Nitrous Blue "KB43VER"
2014 370z Mag Blk 6M "KOKURYU" (Black Dragon)
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