This sounds like a power save issue or a screen saver problem and they are both on the same panel I will lead you to
Right click on an EMPTY part of the desktop then click properties
Click the screensaver tab then the POWER settings.
Make sure all the boxes say NEVER then APPLY.
Its up to you if you want it to ask for a password when it comes off the screensaver (my pref is for no) then click apply then ok.
When you are back at the screensaver tab change both the screensaver to one of the other windows defaults and also check how long before it goes to screensaver and maybe up that to at least 15 minutes unless you have a plasma screen in which case no more than 5 minutes.
you may need to click apply again then OK
now sit back and wait. and whilst you do that check the manual and controls for the monitor in case it too has a built in saver and if so make any changes you need there.
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