Displays Windows 7 power management wont turn off monitors

A bit of an odd one here.
A mate has a computer with windows 7 64bit installed and been having a problem he never experienced before: the power management wont turn off monitors after the time he set it up to do. Even when he installed a third party app to turn off monitors with a click they turn back on again right away. So something is actively turning the monitors back on.

Now the funny thing is, when he installed windows 8, it did not have any problems. Only on windows 7. So I assume that the monitors are not at fault.

He has also tried switching off the network, mouse and keyboard power management wake up, and still wont they won't power off.

Any thoughts?

 

Do the monitors have an option to turn themselves off when no signal received?

 

What graphics card is he using? I wonder if there's something in the drivers' control panel causing a problem. It might explain why it only does it in one OS.

 

Sorry do not fully understand the question.

Will find out and post back.

 

Specs for the PC if that helps at all.

-Gigabyte GA-X79-UP4 Socket 2011 (rev.1.0) -
-Gigabyte GTX 780 3GB GDDR5
-Be Quiet Dark Power Pro 10 1000W PSU
-Intel Core i7 4820K 3.70GHz Socket 2011
-Seagate 2TB BARRACUDA 3.5" SATA-III Hard Drive - 7200RPM 64MB Cache -
-DESKSTAR IDK 4TB SATA 7200 RPM Hard Drive
-Corsair 16GB (2x 8GB) DDR3 1866MHz DOMINATOR Platinum Memory Kit (9-10-9-27) 1.5V