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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 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-out” appears for 10 seconds.
If the OSD is
locked, press and hold the Menu button for 10 seconds to unlock the
If the OSD is unlocked, press and hold the Menu button for 10
seconds to lock the OSD.
Click on the "monitor user's guide" link to download.
There are four adjustable options on the OSD settings screen: Lock OSD settings, Timeout, H Position, and V Position. To change OSD settings: 1 Open the OSD setting screen under the Advanced menu. See “Using the On Screen Display” on page 25. 2 Press the Browse buttons to select the option you want to adjust. 3 Press the Select button to check the option. To change OSD lock setting: 1 Press the Browse button to select yes (lock) or no (unlock). The setting is automatically saved when you change the value. 2 Choose Exit sub-menu and press the Select button to return to the OSD Main Menu or press the Menu button to exit OSD. NOTE: Once OSD is locked, all OSD functions including the shortcut buttons are disabled. If OSD is locked, pressing any button on the monitor directly opens the Lock OSD settings window so that you can unlock OSD.
I have a hanns g 22" widepanel , I had the same problem with lockout. I had my monitor disc and looked on it, or in a manual if you still have it. Here is the combination I had to press and it worked. I pressed the arrow buttons and the menu button all together a few times and it unlocked. Try that!
Function Key Lock: Press the <「Volume -」, >「Volume +」and the 「Menu」buttons simultaneously to enable the Function Key Lock. When the Function Key Lock is enabled, only the Power button is active. Press the <「Volume -」, >「Volume +」and the 「Menu」buttons simultaneously again to unlock the function keys.
I had precisely the same problem... I depressed the Menu Button for about twelve seconds or more and the menu actually finally popped up; and does so now every time I depress Menu! Hope this works for you.