LCD monitor's blinking

Hello. So yesterday, I was playing a game, and my monitor went black, even though, power supply was good and power button was on. Restarted my pc, power supply, but it isn't showing anything.
So I plugged in another monitor, and it started blinking in random periods of time (power button is still on always), it went black completely few times, but I just turned off and on again, and now, it doesn't show anything.

So where's the problem? My computer is new, bought it not even a month ago, and it was all fine...