after varies test on differem circuits, Something should have wrong with the mess of in and out wires, and Arduino refuses to go. A "device is not responding" prompt is the only answer, and on pushing reset button there is only ONE pulse on pin 13, instead of the usual set of 3. The power led is regualrly on. Do I have sadly roasted out Arduino? It' possible (and worthwhile) to change the only atmega chip, or shoud I replace the entire card?