Does not matter, watching video, plaing game, or doing nothing, headphones connected or not, noise tone is the same.
Only if Pimax is not working, when it green light, there is no noise. When light is blue there is noise.
Also I tried the laptop on battery, and even with it Pimax produced noise, so this is not because of "bad power".
Thanks. Power button works, now I got it. But 7-8 seconds .. that is much more than I expected, tried only 2-3 seconds.