Hi again,
I've tried to unmount the wing from the Papilio and have re-plugged them together.
Now after having plugged the usb wire, the screen is blinking differently: the upper row is blinking with a very good contrast (16 squares), the lower row of the screen is blinking lightly too as previously but 16 squares this time.
So I've repeated the same procedure as before but nothing happens when I launch the Papilio loader.
Many thanks in advance for your help.