My Acer Aspire One PC Notebook speakers stopped working

Hotkeys
The computer employs hotkeys or key combinations to access most of the
computer's controls like screen brightness, volume output and the BIOS utility.
To activate hotkeys, press and hold the <Fn> key before pressing the other key
in the hotkey combination.

<Fn> + <F8> Speaker toggle Turns the speakers on and off.

<Fn> + < > Volume up Increases the sound volume
(only for certain models).

<Fn> + < > Volume down Decreases the sound volume
(only for certain models).