Problem with TESTATA message

I have a problem related to installation and recognizing ports. I use Leonardo Arduino and Windows 7. It appears continuously the message «TESTATA» in the serial monitor; it's the message by the default program in the Arduino Leonardo. When arduino can't find a serial input you've asked for it returns "TESTATA".

Anyone can help me? =(

Thank you so much

Hi to everyone.

I have the same problem...but on with Arduino Micro; I tryed to use Arduino UNO and there isn't problem.

The sketch is:

int EV = 11;
char data = '0';

void setup() {
// APRO LA SERIALE

Serial.begin (9600);
while (!Serial)
pinMode (EV,OUTPUT);
Serial.println ("pronto");

}

void loop() {
// LEGGO LA SERIALE

data = Serial.read();
if (data=='O'){
Serial.println("aperto");

}

else if (data=='C'){
Serial.println("chiuso");

}

}

On arduino Uno is ok, on arduino micro, the serialmonitor repeat "TESTATA" and can't to send a message.

In this forum post: http://forum.arduino.cc/index.php?topic=116908.0 at least one person found that moving to a different USB port fixed the problem.