Iiyama ProLite E430 User Manual page 27

Problem
*
F
No sound.
*
G
The sound is too
loud or too quiet.
* H
A strange noise is
heard.
* Available for ProLite E430S / ProLite E431S only
The audio equipment (computer etc.) is ON.
The Audio Cable is properly connected.
The Volume is turned up.
The Mute is OFF.
The audio output level of the audio equipment is within the specification of
the monitor.
The audio output level of the audio equipment is within the specification of
the monitor.
The Audio Cable is properly connected.
Check
TROUBLE SHOOTING 22