Samsung SyncMaster 740NW Manual page 44

Menu
After pushing the "MENU" button more than 5 seconds, OSD function is
locked (unlocked).
Locked
MagicBright™
Menu
Push the MagicBright button to circle through available preconfigured
MagicBright™ modes.
- Six different modes (Custom/Text/Internet/Game/Sport/Movie)
Brightness
Description
You can adjust only the brightness and contrast of the
monitor with the OSD adjustment locking feature.
Description