Question Glitchiness in dark areas on my monitor ?

Apr 21, 2021
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After a few hours of gaming I start to get this weird glitching in dark areas on my screen, and eventually it goes across the whole screen and my whole screen goes black. I thought it was my graphics card but I tested it with another one and it still happens.
My GPU is an MSI GTX 970 and my monitor is an Acer S240HL
It is REALLY terrible when gaming so any help is much appreciated.

The rest of my specs are Ryzen 5 3600, MSI B450M Mortar Max, Crucial Ballistix 2x8GB 3200HMZ, WD Blue 500GB Sata SSD, if that helps.

 

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