Windows 10: Why my monitor goes OFF after some standby time ??

I have Windows 10 Pro, ver. 1709, on a Dell Vostro 3668 desktop.

My monitor doesn't remain in stand-by mode (LED blinking) as much as required, but goes OFF both when the PC is idle & ON and when the PC is sleeping. The same monitor used to remain in stand-by mode forever (as much as I wanted) without going OFF, In Windows 7 and Windows XP. Now I have set the time for Display Turn Off on 15 minutes. This option is supposed to send it to stand-by mode and keep it there as long as I wish. But instead of that, after 15 minutes of stand-by mode it goes OFF.

How I can make the monitor remaining in stand-by mode as much as I want both when the PC is ON & idle and when the PC is sleeping ??

:)

 

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