I have a problem with the monitor LG Flatron L1918s when I turned my computer is on the monitor outputs (OSD unlocked, locked OSD). What do I do all I tried to repair it

SOURCE: Message: OSD LOCKED'' when i press a button on my LG Flatron L1720

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

SOURCE: Flatron L1919S (Black) LCD Monitor: Is my LCD monitor, LG Flatron L1918S, good enough ...

You should google this. After looking myself i have seen that it should play HD movies without a problem.