Screen go black after 20 min

[tjug17]

I have an Asus monitor with an Asus gtx 660
Whenever i watch a movie or leave my computer for 15-20 min the screen turns black and i have to click stuff to turn it back on again
any idea how to stop this?
i dont want to turn off hybrid or anything just in case it's not it
t.y

 

[Tradesman1]

Change your power savings settings Control Panel - Power Options - change settings for Plan - turn off the display - and put a time limit on it or select Never