22" inch new display - major artifacts and they say its envonronmental?

i have massive artifacts on my new monitor, especially in dark areas. little red pixels that are like red fairly dust. then when my computer goes on screen saver, the monitor will eventually turn into 3-4 blocks of color and you can't see anything. type in my password and it's back to normal.
sometimes when artifacts get really bad if i tap the monitor, they go away for a split second.
i have had the monitor in and my mac and they say both are totoally fine.
what's the deal?

Fantastic post/info/synopsis J.C., thank you kindly!

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