Samsung 400Pn, 400P Owner's Manual page 109

Available Mode
OSD Description
MDC Move to the Multi Control OSD screen.
Set the Safety Lock function.
LOCK
1) Lock On
: It will be locked on.
2) Lock Off
: It wil be locked off.
: PC / BNC / DVI
When setting the Lock function, you can only
operate power and lock buttons on the remote
control and set.
The preset password on the monitor is "0000".
: AV : S-Video : Component
Play
1) Lock On
2) Lock Off