Samsung SyncMaster 740NPlus Manual page 27

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
modes.
MagicBright™
- Seven different modes
(Custom/Text/Internet/Game/Sport/Movie/Dynamic Contrast)
Brightness
Description
You can also adjust the brightness and contrast of the
monitor with the OSD adjustment locking feature.
Description