17" HP monitor sound is off. States that OSD is locked.How do I unlock

Please try this:
OSD Lock ?The OSD can be enabled or disabled by
pressing and holding the Menu button on the front panel for
10 seconds. If the OSD is locked, the warning message
?SD Lock?displays for 10 seconds.
?If the OSD is locked, press and hold the Menu button for
10 seconds to unlock the OSD.
?If the OSD is unlocked, press and hold the Menu button
for 10 seconds to lock the OSD.

http://www.fixya.com/support/r4460477-hp_vs_15_17_19_f_1705_1905_lock

Please leave rating if it helps.
Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

The OSD can be enabled or disabled by pressing and holding the Menu button on the front panel for 10 seconds. If the OSD is locked, the warning message OSD Lock displays for ten seconds.

* If the OSD is locked, press and hold the Menu button for 10 seconds to unlock the OSD.
* If the OSD is unlocked, press and hold the Menu button for 10 seconds to lock the OSD.

hold OSD BUTTON FOR 20 SECONDS TO UNLOCK

Press the 1 key and the down arrow key for 5 seconds and it should unlock the OSD.

Normally the OSD lock will only be displayed for 5 seconds.
Regardless you should be able to get rid of it by pressing holding the up arrow key for 10 seconds.
If this fails to resolve the issue try this. Disconnect power cord. Now press and hold button 1. Plug the power cord back in. You may have to press the power button while still holding button 1. The OSD lock should clear after that.
Hope this helps.

Hold the menu button for at least 10 seconds to unlock OSD.

Here is the tip to solve your problem. Hope this might be helpful to you.

OSD Lock—The OSD can be enabled or disabled by pressing and holding the Menu button on the front panel for 10 seconds. If the OSD is locked, the warning message “OSD Lock” displays for five seconds.

❏If the OSD is locked, press and hold the Menu button for 10 seconds to unlock the OSD.

❏If the OSD is unlocked, press and hold the Menu button for 10 seconds to lock the OSD.

Good luck!

This is the function that locks the OSD in order to keep the current states of
settings or prevent others from adjusting the current settings.

1. Lock : Hold down the menu button for more than five seconds to activate
the OSD adjustment lock function.

2. Unlock : Hold down the menu button for more than five seconds to
deactivate the OSD adjustment lock function.

Though the OSD adjustment lock function is activated, you can still
adjust the brightness and contrast, and adjust MagicBright ( )
using the Direct button.

Found at: http://www.retrevo.com/support/Samsung-713BM-PLUS-Monitors-manual/id/2994ag905/t/2/

Hope this helps and please remeber to give me a rating, thanks!

OpenSource13

Assuming this is a E70fB monitor
OSD Unlock : Press and hold the [1] and [▼] buttons again for 5 seconds. The message “OSD UNLOCK” will then display briefly, indicating that the OSD image settings are now unlocked.
Userguide available at http://www.viewsonic.com/assets/027/7929.pdf 

OSD Lock
OSD Lock function prevents unwanted changes to display settings

use the link for downloading a pdf file which will help you understand more and change settings for OSD Lock....
http://h10032.www1.hp.com/ctg/Manual/c00045914.pdf

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