APM 2.6 ESCs won't power up

I am new at quad copters (and forums) please bear with me. I am going through the steps setting up a apm 2.6 mega with external compass / ublox gps. with everything plugged in I can’t get the esc,s to power up. I am at the point to sync them and I get nothing. I am using the directions on line along with utube video.

Thanks for any help here!

Hi, what esc’s are you using? upload a video of how you are connecting and powering the esc’s, it’s probably something simple beeing overlooked.