Acer Aspire All-in-one Black Screen?

Most desktop monitors, when inactive for periods of time(usually preset in o.s. or altered for individual tastes) saves electricity by powering down the monitor, and let it "sleep", but any programs running on the cpu, continue on, unabated. But with these Acer Aspire All-in-one compters are different, i may be listening to an internet radio station, and even though it's not a computer program running,,after a time of inactivity of my manually working (via my keyboard) or something like that, the screen goes black and it kills the internet connection to the internet radio i am listening to. Yes,,if that happens,,i only have to jiggle or move my mouse to turn the screen back on, but is a real pain to have to continually jar the mouse to keep the radio on. Any ideas on how to avoid this black screen of killing my internet radio, and downloads??or anything going on ,while the screen is active?