"Turn Off Display After 15 Minutes" only works occasionally on new HP All In One desktop running Windows 7

I have a new HP "All In One" desktop.
There is no separate tower and monitor.
In the past, I'd leave the PC running all night (to do virus scans etc) and shut off the monitor.
This is not possible with this unit, so the dealer suggested using power options
and setting to "Turn Off Display After 15 Minutes" and also selecting "Never Allow Computer To Sleep".
This plan appeared to work for a short time.
Lately, the monitor does not turn off after the aforementioned 15 minutes.
So I end up having to Shut Down.
Also noticed that my Screen Saver does not engage on these occasions either.
Am I missing a step somewhere?

Anwsers to the Problem "Turn Off Display After 15 Minutes" only works occasionally on new HP All In One desktop running Windows 7



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