I have the same issue I think. I was using a 12VDC 800ma power supply connected to J1 to power the arduino board. After flashing I then disconnecting it for the first time. When I reconected the power supply again to J1 the LED's DS1 or DS2 would not light up at all. However if I use the J16 USB it powers up fine. So I am clueless on what happened.
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