Blinking

In general, this garbage is happening: I'm sitting, for example, on YouTube. I watch the video, and then a bug appears: the page starts blinking and the search disappears at the top, it just blinks until you minimize or change the tab. The same garbage happens in the incentive, the steam itself starts blinking (not the screen). I don’t know what it’s connected with. The same glitch was on another computer. I changed the video card, processor, RAM, motherboard. I think either the hard drive is a problem, or the screen. Help me to understand.