Dell 1707FPc Service Manual page 15

OSD Lock
Language Select to have the OSD display in one of five languages (English, French,
Spanish, German, or Japanese).
You can select to have the audio on or off when the monitor is in power saving
Audio
mode.
(optional)
Yes — enables audio
No — disables audio (default)
NOTE: When the OSD is locked, pressing the menu button takes the
user directly to the OSD settings menu, with OSD Lock selected.
Select No (-) to unlock and allow user access to all applicable settings.
NOTE: You can also lock or unlock the OSD by pushing and holding
the Menu button for 15 seconds.
NOTE: The change only affects the OSD. It has no effect on any
software running on the computer.
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Dell 1707FPc