Planar PLL2410W User Manual page 10

Option 2: OSD & Power button lock – all 5 buttons including the "POWER" button are locked.
Press and hold the 1 button and the ▼ button for 3 seconds to lock all 5 buttons.
The LED LCD Monitor will show an "Lock Out" message for 5~10 seconds and the message will
disappear automatically.
Repeat this step to unlock.
8