Motors wont spin during ESC calibration (or after arming)

Hello everyone, I am unable to get my motors to spin even during the ESC calibration. The calibration seems to be successful, with all correct beeps and confirming lights but at the end the ESC's just keep beeping when I move the sticks and the motos twitch but dont spin. Later I am able to arm the motors (confirmed by steady light on APM) but again the ESC's just beep at me and nothing moves.

 

The build: 3DR Hexa B with 3DR Esc's and motors, APM 2.5 with PM powering the APM. Spektrum DX6i w/AR6100 6ch receiver. Everything went smoothly on rest of build. GPS, telemetry etc all working. I did end up with an extra cable with 5 pins on one end and 4 on the other with 3 black and one red wire that I did not know what to do with. Also the  

 

Has anyone seen this problem before? Am I missing something on setup? My receiver is being powered from APM via 2 wire plug provided, but the small 2 wire power plug from PDB is unused, is that because the new APM is powered by the PM?

 

Cheers,

 

 

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