No sound from Casio LK 45 keyboard's built in speakers. I think a combination of buttons have been pressed by my nephew and it suddenly doesn't produce any sound. Everything else seems fine. I've checked Local Control etc as per manual, but now I'm stumped.

SOURCE: Need replacement key set for Casio LK-110

You would need to call casio for such parts or go to a part store which by googling it you can find the parts for this unit.

SOURCE: Casio keyboard lit up, no sound, no responses

Unplug for several minutes and try again.

If that doesn't work, look up the "factory reset" procedure for your particular model via google and follow that procedure. It usually involves holding certain buttons down before and during power up.

SOURCE: the keyboard works fine but

Read your manual regarding "fingered chords" and similar subjects. It sounds like you are in a single fingered chord mode...

SOURCE: Hi - there is no

There aapparently is no reset proceedure other than cycling the power. You don't tell us if you are on battery or an adapter. Use of incorrect adapter or failing batteries could cause this. The lights run LONG after the batteries will no longer generate sounds. If on an adapter, try using fresh batteries to see if it might work on battery... if it does, then your adpater or the connector may be bad.