Check if the power supply is connected and powered. Then press the two buttons near the power symbol, Octave Transpose <- and -> simultaneously for 2 seconds. Then, Kyra will power up within a few seconds.
To switch Kyra off, please press and hold both Octave Transpose buttons until Kyra powers down. Do not pull the power cable or disconnect mains power while Kyra is switched on as this can result in data loss.