spcomputing:
You might want to check the rest of the board with a set of 3 fresh 1.5 batteries and introduce the power supply to the Vin(+) and Gnd(-). The battery supply should bypass the regulator and let you know where things are.
Do you really mean use the 5V and Gnd pins? Vin pin just feeds the input of the on-board regulator.
Lefty