PixHack, T-Motors ESCs and not turning motors

I am attempting to build my first Discovery Pro TBS with the PixHack FC and T-Motors 70amp ESCs - planning to haul some big batteries under some 18" props.

I cannot get the motors to run.

When I unlock with the button - the safety button turns from flashing to solid.

The status led is GREEN

There is a solid long beep from the drone when the sticks are put in the startup direction.

Then the status LED goes out and the pixhack reboots.

I have tested the ESCs on another FC and they work fine.

I have removed the ESC wires totally and the system still has the problem.

When I run the initialization setup in mission planner using the wizard i get to the final few screens and everything is checked off green.

I don;t know what I am missing and I don’t know if this is enough info for you. I tried SEARCH but I couldnt find an answer.

Thank you for any help
chris