Technics cd player

It sounds like maybe your CD player is now connected to a different input on your amplifier. In such a case, if you turn the amp right up you will just about be able to hear any other sources that are connected & sending audio to the amp.

Turn the amp down to a sensible volume (to avoid possibility of heart attack from the shock of the loud music suddenly returning!), and flick through the other inputs on your amp. If this doesn't help, check your connections & make sure the CD player isn't connected to the tape in or out on your amp.