Hello, I have recently started suface mounting all of the components on my projects. I haven't had much of a problem until now. I have built 3 fairly large circuits (for me, approximately 50-60 sm parts per board ). Now that it is reflowed, and doesn't work (can't connect to microcontroller using programmer on one w/o p/s whine, low resistance from power to ground (boards (both boards), power supply whines when plugging it in (1)) I need some type of method for finding the problem area(s). I have two switching regulator circuits from NI, a dsPIC304013 microcontroller, and all of its I/O / rs232 / CAN peripheral components, a couple of analog circuits going to inclinometers.. etc. I have no idea where to start...any suggestions would be appreciated, and if anyone would like to see any of the circuits (they are separate drawings for each) let me know.