VIEWSONIC TD2455 23.8" 16:9 Multi-Touch IPS Monitor - Manual (Page 27)

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Key Description
2 + 4 Press and hold the keys to lock/unlock the Power button.
When the menu appears on the screen, continue holding both keys
for 10 seconds to lock/unlock the Power button.
3
Power Lock/Unlock
Locking Power Button
Press and hold for 10s
to lock power
If the Power button is locked, the below message will appear on
the screen:
Power Lock/Unlock
Power Button Locked
3 + 5 Press the keys to display/hide the boot up screen when the device
is turned on.
Boot Up Screen On/Off
Off
Press to turn on