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There Are Screen Glitches on Normal Desktop Usage But not in Safe Mode

I've a iMac Late 2009 model with latest version of MacOS High Sierra and there are screen glitches/flickering on normal desktop usage but not in safe mode. Where is the problem?

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Answer by bmike for There Are Screen Glitches on Normal Desktop Usage But not...

Safe mode disables almost all GPU acceleration and fancy features, so you have a system where either the GPU itself has failed or the drivers / part of the system that run accelerated and fancy...

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