Monitor does not Turnoff by a Timer

[Demetrius]

Whenever I leave my computer free, I use set my monitor to turnoff automatically within a specific period of time by applying timer. However the monitor does not turnoff itself instead it has to ?
Can someone help me with this?

[Birdie]

This problem may occur if the following conditions exist:

• You may have set your computer's power button to the "Power Off" setting.
• You may have press the computer's power button.
• A program denies the shutdown request.

[David23]

I would like to give you probably the best option to solve your problem.
You can simply download the program called Turn Off Monitor.

Turn Off Monitor is a utility by which you can turn monitor off using either a shortcut key or a shortcut icon or an icon in system tray.
Turning Off Monitor when not in use saves electricity which is not the same as running a blank screensaver.
The utility allows to turn off monitor or start / launch screensaver after n minutes or after computer remains idle for n minutes.

Download

[Archibald]

If the system-power-state data contains information from a canceled request, then this problem is likely to occur.
When Windows tries to turn off the monitor, it cannot.