This message appears on my screan in no particular timing; "OSD MAIN CONTROL LOCK"

OSD LOCKED/UNLOCKED
This function allows you to lock the current control settings, so that they cannot be inadvertently changed. Press and hold the MENU button for several seconds. The message "OSD LOCKED" should appear. You can unlock the OSD controls at any time by pushing the MENU button for several seconds. The message "OSD UNLOCKED" should appear.

Change the OSD Lock option from ON to OFF by following these steps:

Press the Menu button on the remote or the control panel for 15 seconds to unlock the OSD menu.

When the OSD menu appears, select the Management option at the Main Menu, then select OFF at the OSD Lock option.

Select Exit to save the setting and exit the menu.

hope this helps

OSD LOCKED/UNLOCKED
This function allows you to lock the current control settings, so that they cannot be inadvertently changed. Press and hold the MENU button for several seconds. The message "OSD LOCKED" should appear. You can unlock the OSD controls at any time by pushing the MENU button for several seconds. The message "OSD UNLOCKED" should appear. system admin

· The OSD Lock Out Message

Power your computer completely off and then remove the monitor cable from the port on the back side of the computer case. Reattach the cable and make sure the pins are correctly screwed in all of the way. Power the computer back on and check to see if the OSD lock out message is still being displayed.

· 2

Check the manual that came with your computer or monitor and locate the troubleshooting section if you are still receiving the OSD lock out message. Find the OSD lock out heading and read the method that your particular model of monitor uses to remove the lock out. Follow the instructions to remove the lock out.

· 3

Attempt generic lock out removal procedures if you no longer have the manual that came with your monitor. Press and hold the "Menu" button located at the bottom end of your monitor for 15 seconds and wait to see if the OSD lock out message disappears.

· 4

Press the "Menu" button again if the lock out message remains on the screen. Use the arrow buttons to navigate through the main menu options. Highlight the "Settings" or "OSD Menu" option and then hit the Menu key again to access the new list of settings.

· 5

The OSD Settings Menu
Scroll down to the "OSD Lock" heading. Use the arrow keys to change the setting to "No." Hit the Menu key again to return to the main menu. Scroll over to the "Exit" setting and then hit the Menu key a final time to exit the menu setting and remove the OSD lock out

Hi there.

I suggest you see my tip on fixing that irritating OSD lockout message here: http://www.fixya.com/support/r9424404-fix_osd_lockout_or_screen_display

Slasher_X

The following site has step by step instructions on steps you can try: http://www.ehow.com/how_5008634_fix-lockout-display-computer-monitor.html
I'll paste them below: All computer monitors, whether they are LCD or CRT style, have a built-in feature called the on screen display (OSD) lock out that prevents users from viewing any images on the monitor. If your computer screen has accidentally been set to the OSD lock out setting, there are several different ways you can remove the lock out, depending on the make and model of your particular computer monitor.
1 Power your computer completely off and then remove the monitor cable from the port on the back side of the computer case. Reattach the cable and make sure the pins are correctly screwed in all of the way. Power the computer back on and check to see if the OSD lock out message is still being displayed.
2 Check the manual that came with your computer or monitor and locate the troubleshooting section if you are still receiving the OSD lock out message. Find the OSD lock out heading and read the method that your particular model of monitor uses to remove the lock out. Follow the instructions to remove the lock out.
3 Attempt generic lock out removal procedures if you no longer have the manual that came with your monitor. Press and hold the "Menu" button located at the bottom end of your monitor for 15 seconds and wait to see if the OSD lock out message disappears.
4 Press the "Menu" button again if the lock out message remains on the screen. Use the arrow buttons to navigate through the main menu options. Highlight the "Settings" or "OSD Menu" option and then hit the Menu key again to access the new list of settings.
5 Scroll down to the "OSD Lock" heading. Use the arrow keys to change the setting to "No." Hit the Menu key again to return to the main menu. Scroll over to the "Exit" setting and then hit the Menu key a final time to exit the menu setting and remove the OSD lock out.

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.

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 the MENU button for ten seconds to unlock or lock the OSD.

This information is from your manual for the L194WT:
OSD LOCKED/UNLOCKED
This function allows you to lock the current control settings, so that they cannot be inadvertently changed. Press and hold the MENU button for several seconds. The message "OSD LOCKED" should appear. You can unlock the OSD controls at any time by pushing the MENU button for several seconds. The message "OSD UNLOCKED" should appear.


Please rate me if this solution works for you

Thanks......Have a great time

1. Power your computer completely off and then remove the monitor cable from the port on the back side of the computer case. Reattach the cable and make sure the pins are correctly screwed in all of the way. Power the computer back on and check to see if the OSD lock out message is still being displayed.
   
2. Step 2 Check the manual that came with your computer or monitor and locate the troubleshooting section if you are still receiving the OSD lock out message. Find the OSD lock out heading and read the method that your particular model of monitor uses to remove the lock out. Follow the instructions to remove the lock out.
   
3. Step 3 Attempt generic lock out removal procedures if you no longer have the manual that came with your monitor. Press and hold the "Menu" button located at the bottom end of your monitor for 15 seconds and wait to see if the OSD lock out message disappears.
   
4. Step 4 Press the "Menu" button again if the lock out message remains on the screen. Use the arrow buttons to navigate through the main menu options. Highlight the "Settings" or "OSD Menu" option and then hit the Menu key again to access the new list of settings.
   
5. Step 5 jQuery(document).ready(function(){ jQuery('#jsArticleStep5 span.image a:first').attr('href','http://i.ehow.com/images/a04/or/7q/fix-lockout-display-computer-monitor-1.5-800X800.jpg'); }); The OSD Settings Menu Scroll down to the "OSD Lock" heading. Use the arrow keys to change the setting to "No." Hit the Menu key again to return to the main menu. Scroll over to the "Exit" setting and then hit the Menu key a final time to exit the menu setting and remove the OSD lock out.