APM 2.0 Rebooting on Thrust

I was hoping one of the moderators could help me out with a quick issue... 

Recently, upon plugging in the battery, the APM 2.0 board will not boot correctly, no arm or gps LEDs lit.  I simply reset using the button and everything is fine, although th

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APM output voltage on pins 3-4 unresponsive. Toubleshooting tips?

Greetings drone community!  First time poster here.

 

I've been getting through my first arducopter build and have hit a snag that I'm having problems troubleshooting.  Any advice you experts can give would be very helpful.

 

I'm at the step where I shou

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