Hawk power path controler

I am having an issue that  is strange ,  the only I get the 5v power  on the VDD_5V_PERIPH  line is when it is connected to usb cable  and pc. If I connect the power  cable all the lights on the we will  light  up . If I power feed it by the power terminal from the 3dr quad to the servo input all lights up but there is no power on  the VDD_5V_PERIPH  line . The only time there is 5v on this line is when it is connected  to the usb port. Look at the schematic  it looks like the power path controller should handle  this and I appears it is doing this on all the 3.3v lines . Any suggestions? Now don't get  mad at me guys but this is an rtfhawk . 

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