HI
I am a noob learning as I go and appreciate any assistance.
I had a Neutrino that had no power to the board. I bumped my mutimeter into both positive lugs of the DC jack and it fired up. I soldered a jumper to the two + lugs of the dc jack: the battery snap and the dc power and now it works fine.
What did I do? Why did it not work before and now work with a jumper?
Because you wired the board to the battery +. It breaks contact when a jack is inserted and disconnects the battery.
https://www.smallbearelec.com/catalog/DCjack.jpg
Thanks I appreciate the answer