Dell 1708FP Monitor - Manual (Page 21)

NOTE: The change only affects the OSD. It has no effect on any software running on the computer.
Audio
(optional)
You can select to have the audio on or off when the monitor is in power saving mode.
Yes — enables audio
No — disables audio (default)
NOTE: When the Dell Soundbar is not properly connected to the monitor, the audio menu is not available.
Factory
Reset:
Reset the OSD menu options to the factory preset values.