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To unlock the OSD (onscreen display control), turn off the monitor and then press and hold the Menu button on the monitor. Then press the power button to turn the monitor back on. Do not release the Menu button before pressing the power button. This same step (holding the Menu button and then pressing the power button) enables the OSD lock. The menu button is the top button on the right side of the monitor (on the bezel). The power button is the bottom button of the group. AOC has the documentation for the 2036sa here: http://us.aoc.com/monitor_displays/2036sa . See page 20 of the User's Guide for the OSD lock procedure. The picture of the monitor buttons is on page 19. The guide is available as a PDF on the AOC site. Note: you will need Adobe Reader or a similar program to read the file.
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.
OSD Locked means that your On Screen Display is locked. That basically means you can't access/change the menu settings. The way to unlock the OSD varies from manufacturer to manufacturer and even monitor to monitor. Here are a couple different ways to unlock it:
1) 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.
2) Go to Menu and select OSD settings and change the setting for the OSD Lock. For example if it is a "+" then make it a "-" or a "On", then make it an "Off", or an "Enable" then make it a "Disable".
If neither of these work, I would contact customer support for your monitor from the manufacturer. They should be able to tell you how to turn off the OSD Lock.
How to unlock HP 1940 LCD monitor?? i try with holding menu button and power also..but didnt show me unlock...i hold like 1min even more...and its keep to blink OSD lock...and Main Menu on my screen.Can u tell what i need to do Thank you