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Motor arms but won't spin

I’m completetly stuck.

When I plug in my 4 cell Lipo my ESC beeps 4 times and the motor twitches. This is the only sound - there is no other tone after the 4 beeps.

Opening the throttle does nothing - the motor won’t spin.

I’ve set ARMING_CHECK and ARMING_REQUIRE to zero in Mission Planner

Am I missing something?

Also check you have geofence turned off as well

Does mission planner give any error indication as to why it will not ground start

Have you gone through the ESC calibration process.

This may be a silly question but are you arming the APM?
Right rudder for 4 seconds?
I asume APM because you have not mentioned the safety that PixHawk uses.

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