I have a Sparkfun MIDI shield and am using kuk's "MIDI in basic 0.2" code from the old Arduino forum: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1187962258
Vin pin from a 9V battery, switched. Pin2-7 LEDs Pin13 status LED
Pins 2-7 + Ground go to an 8-pin connector flush-mounted to my project box. I am able to power on Arduino when the signal cable (15') is not patched to that 8-pin connector, but if the connection is made then Arduino will not power on.
Does anyone know why I can't boot Arduino if the signal cable is patched?
(Of course I hope I've posted this in the right place. Please inform if not.)