Monitor goes to sleep when playing movie

[rika_21]

my monitor going to sleep when watching movie online in mozila, my monitor is Hp and i have to setting in control panel"never" but it doesn't working, plese help me..

 

[electronian]

Quit playing "Dune" (that always puts me to sleep). No, just kidding.
You aren't playing it with Cyberlink PowerDVD 9, are you?