My HP computer has a message that reads OSD Locked when I try to turn up the volume to hear music or a movie clip. I used to be able to turn up the volume but now I can't. How do I fix this?

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.

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 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.
plz do rate the solution if helped

I did not see anything regarding to the Power locked out function, may be it's time to call HP. Please post back what you find out from HP.
I look at HP WEBSITE: http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01632269&tmp_track_link=ot_recdoc/c01643091/en_us/c01632269/loc:1&lc=en&dlc=en&cc=us&product=3770762


Locking OSD settings
When the OSD is locked, settings cannot be changed in the OSD menu. The OSD functionality is enabled or disabled by pressing the Menu button and holding it for 10 seconds. Upon disabling the OSD, an OSD Lock-out message is displayed for 10 seconds. When the OSD is locked and an OSD menu button is pressed, the OSD Lock-out message is displayed for an additional 10 seconds. When the OSD is locked, pressing the OSD menu button for 10 seconds unlocks the OSD and displays the main menu. Identifying monitor conditions
Special messages display on the monitor screen for the following monitor conditions:

• Input Signal Out of Range : Indicates the monitor does not support the input signal because the resolution and/or refresh rate are set higher than the monitor supports. Recommended refresh rates are as follows:
• For the w1858 monitor: 1366 x 768 @ 60 Hz.
• For the w2338h monitor: 1920 x 1080 @ 60 Hz.
• Monitor Going to Sleep : Indicates the screen display is entering a sleep mode.
• Check Video Cable : Indicates a video input cable is not properly connected to the computer or monitor.
• OSD Lock-out : When the OSD is locked, the warning message OSD Lock displays for 10 seconds.
• No Input Signal : Indicates the monitor is not receiving a video signal from the computer on the monitor video input connector. Check whether the computer or input signal source is off or in the power-save mode.
• Auto Adjustment in Progress : Indicates the auto-adjustment function is active and in process.

Please see my profile for instruction, or try below, you should also download user manual from HP:

? 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.

May work the same on other HP model also.
User manual: http://h10025.www1.hp.com/ewfrf/wc/manualCategory?lc=en&dlc=en&cc=us&product=447388&
If you want to see the inside of your monitor, look here:
http://s807.photobucket.com/home/budm/allalbums

To lock or unlock OSD on your Monitor do the following1. Turn off the monitor2. Hold the Menu Button3. Turn on the power by pressing the power button of your monitorNote: make sure you keep the Mouse button pressed while turning on the monitorFor any further assistance please feel free to revert with comments.
Thank you for choosing Fixya

When the OSD is locked, settings cannot be changed in the OSD menu. To Unlock the OSD, press and hold the MENU button on monitor while the monitor is off, then press the Power button to turn the monitor on. To lock the OSD, repeat the Unlocking procedure.

Turn off monitor, hold down the menu button, turn the monitor back on, release the menu button after 10-20 seconds. Your Iiyama screen will now be unlocked.

do your speakers have their own volume knob? sounds like its turned way down,master volume in control panel under audio devices,also volume controll in the sound card software ,nvidia,realtek,maestro,ect. whitch ever one you have,if they are all turned up ,try turning it up useing your hotkeys on your keyboard,if none of that works,uninstall all of your audio drivers,and reinstall them from the support web site at hp.com,the wires that go to that headphone jack inside are very small,doesnt take much to damage them,droping it a couple times is enough,reinstalling the software is the best chance,if that doesnt do anything ,you will have to go inside,if this only happens when your using the optical drive then disregard everything i just said,and replace it.make sure its locked in securely

OSD stands for On Screen Display. You get to it by pressing the Menu button on the front of your monitor.

Here's a link to making adjustments...and unlocking the OSD:

HP f1703

Push the menu button for 5 seconds and the message "OSD UNLOCKED" should appear.
Shady, 14years old :)