Cool but damage to the sound :)

This is my first monitor I buy because I built my own PC. The screen is very beautiful, I like the colors, I think it is cheap for what it is. As against the sound is so so, I do not know if I fell on the bad, but when I play sims or 4 great games, there is a weird sound coming out (continuous buzzing), the more I the sound rises the sizzle increases, and when I do not play these games, the sizzle disappears or if I have to put an audio headset for him to stop.
In short, I am disappointed at this level, but hey it's not like it was the end of the world. This is a good screen anyway!