How can I “reset” an Arduino board?

Question

I\'ve uploaded a sketch to an Arduino Uno whose loop is something like this:

void loop(){
    Serial.println(\"Hello, World!\");
}

So, now,

Answer 1

Here is the best way that works out if you are trying to program through the USB cable:

1. Ground the Tx signal on the board (connect digital I/O #1 to GND)
2. Plug the USB cable
3. Upload a new program
4. Remove the USB cable
5. Remove Tx grounding

You are all set!