unfounded the monitor to turn off during the game

tipo Hello, my friend turned off the monitor when running any game that is browser based, system, the list of such games include nfs:carbon, cs1.6 and other old, filthy toys the beginning of the two thousandth, but the catch is that specifically when playing GTA sa and its multiplayer counterpart, then there is SAMP, - the monitor does not turn off and we are comfortable with him spending time on one of the servers that have specifically tired for months of endless spending time in one game, what to do, maybe it's not in the system? how else to explain the free gameplay in more demanding GTA SA instead of something like carbon fiber or DotA 2, where the monitor does not particularly like to work and it shut off to restart, and turns off only the monitor, not the computer, in discorde friend informs me about the tragic shutdown of the monitor, what to do????