Pixhawk 4 has no output to ESCs when armed

When I arm the Pixhawk and the LED on the GPS module goes from flashing blue to solid blue, the motors should start spinning, however they don't. Initially i thought this would be due to improperly calibrated ESCs, but after recalibrating the error persisted. I have tried different brands of ESCs with different firmware (BLheli and SimonK) but still nothing.

I have the "flight" logs and they show that the pixhawk is outputting a pwm signal in the right range. 

Furthermore sometimes the ESCs start their calibrating procedure upon powering up which is triggered by the pwm signal being max.

Any help would be very much appreciated 

Thanks.

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