I just completed soldering together my first of 2 Modern Device RBBBs. When i plug it in with my FTDI TTL-232R cable I am able to download a sketch, or at least it claims i did, but nothing happens. The only thing i can think of is the first time i hooked it up i plugged the cable in backwards. I get power from the 5v but no blinking led on pin 13. Do you think i fried the chip or cable? All components are at the proper polarity and the solder job looks solid. Any suggestions?