3pi not working after calibration

I’m running the demo program, and after pressing “B”, the robot turn around calibriting it self, but after the second press, it play the sound and show “go!” in the LED, but don’t follow the line.


What does your 3pi do after the second button press? Does it drive off the line following course or does it not move? Can you post a picture of your line following course and the underside of your robot where the reflectance sensor are located?