Hi Bassam,

Several things spring to my mind that could be the cause and they are:-

1) Try using the Technics DATA DISK supplied with your keyboard as this will reset the keyboard to its original 'Factory' settings.

2) Are you using an expression pedal, if so has it inadvertently been left in the 'non sound' position? (have to admit I have made this silly mistake in the past).

3) Press and hold the SET button, go to page 2 and check to see whether the 'ALL OFF' is activated.

4) Have you experienced a power cut recently? because if you have this could be the cause. Until my son fixed POWER SURGE sockets in my music room even a 'blip' in the power would often upset my electrical gadgets including my piano and keyboard.

Hope this helps.

Regards,

Aud (U.K.)