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Yes, this is a brand new board.
The microSD card is not the issue – I have switched cards and get the same result. Both cards work fine if used alone.
I believe the problem lies in the circuitry between the two SD card slots… When only 1 card is inserted (either slot) the board powers on. If both slots have microSD cards inserted simultaneously – no power.
As an extra test, and to isolate the problem, I unplugged everything else from the board except the usb cable to the computer – I get the exact same behavior.