Imac 24, 2021, black lines screen flickering
I was watching Youtube today, and some black lines suddenly flickered on my screen and pulsated. I reported the issue to Apple as a support case. After running the Apple Diagnosis, no hardware problem was checked out. Following the guide of the advisor of Apple Support, I updated the macOS and restarted, but the black lines screen flickering was still there. My one-year warranty passed, and I really do not want to go to an Apple store to check and repair it. It may spent a lot of time and money. I know there is Flexgate Issue with MacBook Pro (2016)Display, I do not think Imac has it. What I should do? Thank you.