different colors sounds like GPU failing, or could be the PSU failing and causing the GPU to suffer. Does it happen randomly or only under stress? what kind of colors?
It happen 1 min into a game like csgo Sometime it will turn Blue,Red,Green and white but other time it just goes all black i just replaced my psu today
Why did you replace psu? Which was the old? Did u get a replacement (same model) or a different model? Which model? The old psu may have damaged the gpu. Its a long shot but try different monitor cables (dvi. VGA. HDMI) sometimes a bad cable can mess with colors but its pretty unlikely that it causes a restart
You upgraded 50 watts?...was sorta wasteful...I'm not sure where to go with this. We can assume for now the PSU isn't the issue (we can't rule it out still).