Hi, you can download a manual and drivers here:
http://www.asrock.com/mb/manual.asp?Model=H61M/U3S3
Its maybe a setting in the control panel for power save mode.
Look under power supply.
You can make a setting so the screen goes in power save mode
after an hour
You can make a setting so it not does that.
Or a setting in the bios for the display.
Look in the manual.
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