Press the SELECT button until the LCD shows the LOAD IMPEDANCE screen. Press and hold the SELECT button for the entire duration of this key sequence... After holding SELECT for two seconds a small box will appear to the right of the 'E' in IMPEDANCE Continue to hold SELECT and toggle the load impedance switch. After another two seconds the small box will shift to match the new position of the LOAD IMPEDANCE switch, once this occurs, toggle the load impedance switch again. At this point you can release the SELECT button as the amplfier is now in DEMO mode. Don't touch any controls during this sequnce until the screen shows "For more info see user manual." Press and hold the SELECT button for 5 seconds, the LED's will then start flashing and the Engineers name will appear on the screen!