Alexis

Hi! I have a px-770, I bought it more than 1 year ago. I tried to connect it through the USB port, and since then, no sound is coming out, either from the speakers, or the headphones if they are plugged in. I tried to reset to factory settings (holding function, midi rec and e. Piano 1 and turn on) but it doesn't change anything. Absolutely no sound (volume button is on max, min or middle range doesn't change anything) Do you have any clue what could be going on? Thanks!