When I turn on my computer after it was off for more than a couple of minutes I see weird artifacts on the bottom 2/3rds of the screen. They disappear before the login screen and seem to get worse the longer PC was off. I tried reseating GPU, different HDMI/DP cables, switching between GPU and MOBO DP ports, enabling CSM and even updated the BIOS but nothing helps. It started happening a week ago without any apparent cause. How to fix it?
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