Osd locked while restarting the computer flatron W1953P

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

Press and hold menu button for a few seconds, pressing and holding, acts as a toggle. So if OSD LOCKED still appears, pressing again UNLOCKS.

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.

On screen display is locked. Fix it by:

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.

change all pressing keys..then press menu key 15 seconds for unlocked.

Below is service manual for this. Hope it helps!
LG Flatron L1750S Service Manual

Press the menu button and hold it in,it will flash up OSD unlocked after a while

Should be as simple as holding the Menu button for several seconds. Give it a try. You should get the message OSD unlocked and then the menu button will function as expected.

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

Press menu button for 5 seconds until the text "OSD Unlocked" appears on the screen.