This is a really annoying problem I've had for some time. Most of the time when I play a game in full screen, my monitor starts making a really high pitched noise that is VERY annoying to the ears. I've looked around for solutions on google, and most of them said to increase or decrease the monitor's refresh rate, but when I go to do that, my monitor only has 1 refresh rate, and there are no options to change it. Any help on fixing this problem would be awesome.
One tiny note: On one of the games that I play, called CounterStrike 2D, I start getting the noise when someone throws a flashbang and the whole screen goes white for a few seconds.